[llvm] [InstCombine] Fix bail-out in `PHIsEqualValue()` (PR #170650)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-x86_64-linux-fast` running on `sanitizer-buildbot4` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/169/builds/17781

<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-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using lld-link: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lld-link
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld64.lld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using wasm-ld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld.lld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/ld.lld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using lld-link: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lld-link
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld64.lld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using wasm-ld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/main.py:74: 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: 94420 tests, 64 workers --
Testing: 
FAIL: LLVM :: ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll (1 of 94420)
******************** TEST 'LLVM :: ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
/home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lli -jit-kind=orc-lazy -orc-lazy-debug=funcs-to-stdout -extra-module /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll    /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/Inputs/noop-main.ll | /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/FileCheck /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll
# executed command: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lli -jit-kind=orc-lazy -orc-lazy-debug=funcs-to-stdout -extra-module /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/Inputs/noop-main.ll
# .---command stderr------------
# | JIT session error: In graph /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll.submodule.0xbf659da80b555fa3.ll-jitted-objectbuffer, section .text: relocation target 0x7d32f9a1f02c (__orc_lcl.str3.3:0x7d32f9a1f030 + 0xfffffffffffffffc) is out of range of Delta32 fixup at address 0x7d32f9a1f030 (printf_wrapper, 0x7932f8a9e000 + 0x3)
# | JIT session error: Failed to materialize symbols: { (main.impl, { printf_wrapper }) }
# `-----------------------------
# error: command failed with exit status: 1
# executed command: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/FileCheck /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll
# .---command stderr------------
# | /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll:16:10: error: CHECK: expected string not found in input
# | ; CHECK: Goodbye from destructor
# |          ^
# | <stdin>:13:26: note: scanning from here
# | Goodbye from __cxa_atexit
# |                          ^
# | <stdin>:14:3: note: possible intended match here
# | [ printf_wrapper ]
# |   ^
# | 
# | Input file: <stdin>
# | Check file: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |             8: [ main ] 
# |             9: [ __lljit_run_atexits atexit ] 
# |            10: [ atexit_handler ] 
Step 10 (stage2/asan_ubsan check) failure: stage2/asan_ubsan check (failure)
...
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using lld-link: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lld-link
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld64.lld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using wasm-ld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld.lld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/ld.lld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using lld-link: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lld-link
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld64.lld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using wasm-ld: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/utils/lit/lit/main.py:74: 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: 94420 tests, 64 workers --
Testing: 
FAIL: LLVM :: ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll (1 of 94420)
******************** TEST 'LLVM :: ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
/home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lli -jit-kind=orc-lazy -orc-lazy-debug=funcs-to-stdout -extra-module /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll    /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/Inputs/noop-main.ll | /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/FileCheck /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll
# executed command: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/lli -jit-kind=orc-lazy -orc-lazy-debug=funcs-to-stdout -extra-module /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/Inputs/noop-main.ll
# .---command stderr------------
# | JIT session error: In graph /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll.submodule.0xbf659da80b555fa3.ll-jitted-objectbuffer, section .text: relocation target 0x7d32f9a1f02c (__orc_lcl.str3.3:0x7d32f9a1f030 + 0xfffffffffffffffc) is out of range of Delta32 fixup at address 0x7d32f9a1f030 (printf_wrapper, 0x7932f8a9e000 + 0x3)
# | JIT session error: Failed to materialize symbols: { (main.impl, { printf_wrapper }) }
# `-----------------------------
# error: command failed with exit status: 1
# executed command: /home/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/FileCheck /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll
# .---command stderr------------
# | /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll:16:10: error: CHECK: expected string not found in input
# | ; CHECK: Goodbye from destructor
# |          ^
# | <stdin>:13:26: note: scanning from here
# | Goodbye from __cxa_atexit
# |                          ^
# | <stdin>:14:3: note: possible intended match here
# | [ printf_wrapper ]
# |   ^
# | 
# | Input file: <stdin>
# | Check file: /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/ExecutionEngine/OrcLazy/global-ctors-and-dtors.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |             8: [ main ] 
# |             9: [ __lljit_run_atexits atexit ] 
# |            10: [ atexit_handler ] 

```

</details>

https://github.com/llvm/llvm-project/pull/170650