[lld] [ELF] Change Ctx::target to unique_ptr (PR #111260)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-asan` running on `sanitizer-buildbot8` while building `lld` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/24/builds/1957

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 82639 of 82640 tests, 48 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.
FAIL: lld :: ELF/aarch64-thunk-bti.s (80178 of 82639)
******************** TEST 'lld :: ELF/aarch64-thunk-bti.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp && split-file /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp && cd /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
+ rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
+ split-file /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
+ cd /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
RUN: at line 3: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=aarch64 asm -o a.o
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=aarch64 asm -o a.o
RUN: at line 4: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld --threads=1 --shared --script=lds a.o -o out.so --defsym absolute=0xf0000000
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld --threads=1 --shared --script=lds a.o -o out.so --defsym absolute=0xf0000000
RUN: at line 5: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so | /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s
RUN: at line 6: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so | /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s --check-prefix=CHECK-PADS
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s --check-prefix=CHECK-PADS
/home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s:250:21: error: CHECK-PADS-NEXT: expected string not found in input
// CHECK-PADS-NEXT: udf #0x0
                    ^
<stdin>:100:29: note: scanning from here
18001048: b 0x18001050 <fn4>
                            ^
<stdin>:103:1: note: possible intended match here
0000000018001050 <fn4>:
^

Input file: <stdin>
Check file: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            .
            .
Step 10 (stage2/asan check) failure: stage2/asan check (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 82639 of 82640 tests, 48 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.
FAIL: lld :: ELF/aarch64-thunk-bti.s (80178 of 82639)
******************** TEST 'lld :: ELF/aarch64-thunk-bti.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp && split-file /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp && cd /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
+ rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
+ split-file /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
+ cd /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/tools/lld/test/ELF/Output/aarch64-thunk-bti.s.tmp
RUN: at line 3: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=aarch64 asm -o a.o
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-mc -filetype=obj -triple=aarch64 asm -o a.o
RUN: at line 4: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld --threads=1 --shared --script=lds a.o -o out.so --defsym absolute=0xf0000000
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/ld.lld --threads=1 --shared --script=lds a.o -o out.so --defsym absolute=0xf0000000
RUN: at line 5: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so | /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s
RUN: at line 6: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so | /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s --check-prefix=CHECK-PADS
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/llvm-objdump -d --no-show-raw-insn out.so
+ /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build_asan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s --check-prefix=CHECK-PADS
/home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s:250:21: error: CHECK-PADS-NEXT: expected string not found in input
// CHECK-PADS-NEXT: udf #0x0
                    ^
<stdin>:100:29: note: scanning from here
18001048: b 0x18001050 <fn4>
                            ^
<stdin>:103:1: note: possible intended match here
0000000018001050 <fn4>:
^

Input file: <stdin>
Check file: /home/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/lld/test/ELF/aarch64-thunk-bti.s

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            .
            .

```

</details>

https://github.com/llvm/llvm-project/pull/111260