[lld] [ELF] Precompute orphan output section names in parallel. NFC (PR #207321)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-hwasan` running on `sanitizer-buildbot11` while building `lld` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/55/builds/30060

<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-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
-- Testing: 100124 tests, 72 workers --
Testing:  0..
FAIL: Clang :: CodeGen/systemz-charset.c (9845 of 100124)
******************** TEST 'Clang :: CodeGen/systemz-charset.c' FAILED ********************
Exit Code: -6

Command Output (stdout):
--
# RUN: at line 1
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c -emit-llvm -triple s390x-none-zos -fexec-charset IBM-1047 -o - | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c -emit-llvm -triple s390x-none-zos -fexec-charset IBM-1047 -o -
# .---command stderr------------
# | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c:24:30: warning: unknown escape sequence '\y' [-Wunknown-escape-sequence]
# |    24 | const char *InvalidEscape = "\y\z";
# |       |                              ^~
# | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c:24:32: warning: unknown escape sequence '\z' [-Wunknown-escape-sequence]
# |    24 | const char *InvalidEscape = "\y\z";
# |       |                                ^~
# | 2 warnings generated.
# | libc++abi: Pure virtual function called!
# `-----------------------------
# error: command failed with exit status: -6
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c
# note: command had no output on stdout or stderr

--

********************
Testing:  0..
FAIL: Clang :: CodeGen/systemz-charset.cpp (9851 of 100124)
******************** TEST 'Clang :: CodeGen/systemz-charset.cpp' FAILED ********************
Exit Code: -6

Command Output (stdout):
--
# RUN: at line 1
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.cpp -emit-llvm -triple s390x-none-zos -std=c++17 -fexec-charset IBM-1047 -o - | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.cpp
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.cpp -emit-llvm -triple s390x-none-zos -std=c++17 -fexec-charset IBM-1047 -o -
# .---command stderr------------
# | libc++abi: Pure virtual function called!
# `-----------------------------
Step 11 (stage2/hwasan check) failure: stage2/hwasan check (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
-- Testing: 100124 tests, 72 workers --
Testing:  0..
FAIL: Clang :: CodeGen/systemz-charset.c (9845 of 100124)
******************** TEST 'Clang :: CodeGen/systemz-charset.c' FAILED ********************
Exit Code: -6

Command Output (stdout):
--
# RUN: at line 1
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c -emit-llvm -triple s390x-none-zos -fexec-charset IBM-1047 -o - | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c -emit-llvm -triple s390x-none-zos -fexec-charset IBM-1047 -o -
# .---command stderr------------
# | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c:24:30: warning: unknown escape sequence '\y' [-Wunknown-escape-sequence]
# |    24 | const char *InvalidEscape = "\y\z";
# |       |                              ^~
# | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c:24:32: warning: unknown escape sequence '\z' [-Wunknown-escape-sequence]
# |    24 | const char *InvalidEscape = "\y\z";
# |       |                                ^~
# | 2 warnings generated.
# | libc++abi: Pure virtual function called!
# `-----------------------------
# error: command failed with exit status: -6
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.c
# note: command had no output on stdout or stderr

--

********************
Testing:  0..
FAIL: Clang :: CodeGen/systemz-charset.cpp (9851 of 100124)
******************** TEST 'Clang :: CodeGen/systemz-charset.cpp' FAILED ********************
Exit Code: -6

Command Output (stdout):
--
# RUN: at line 1
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.cpp -emit-llvm -triple s390x-none-zos -std=c++17 -fexec-charset IBM-1047 -o - | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.cpp
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/23/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/CodeGen/systemz-charset.cpp -emit-llvm -triple s390x-none-zos -std=c++17 -fexec-charset IBM-1047 -o -
# .---command stderr------------
# | libc++abi: Pure virtual function called!
# `-----------------------------

```

</details>

https://github.com/llvm/llvm-project/pull/207321