[lld] [PAC][lld] Do not emit warnings for `-z pac-plt` with valid PAuth core info (PR #112959)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve-vls-2stage` running on `linaro-g3-03` while building `lld` at step 18 "test-suite".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/4/builds/3472

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

```
Step 18 (test-suite) failure: 1200 seconds without output running [b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/bin/python', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/bin/lnt', b'runtest', b'test-suite', b'--no-timestamp', b'--sandbox', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox', b'--test-suite', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/test-suite', b'--cc', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2.install/bin/clang', b'--cxx', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2.install/bin/clang++', b'--use-lit', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1/bin/llvm-lit', b'--build-tool-options', b'"-k"', b'--cmake-define=TEST_SUITE_FORTRAN:STRING=ON', b'--cmake-define=CMAKE_Fortran_COMPILER=/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2.install/bin/flang', b'--cppflags', b'-mcpu=neoverse-512tvb -msve-vector-bits=256 -mllvm -treat-scalable-fixed-error-as-warning=false -O3', b'--threads=32', b'--build-threads=32'], attempting to kill
...
*** MICRO-TEST: benchForLoopWithReductionAutoVecTC4
    exec_time:  2.6961 
*** MICRO-TEST: benchForLoopWithReductionAutoVecTC63
    exec_time:  7.3190 
*** MICRO-TEST: benchForLoopWithReductionAutoVecTC64
    exec_time:  5.0110 
*** MICRO-TEST: benchForLoopWithReductionAutoVecTC7
    exec_time:  3.8548 
*** MICRO-TEST: benchForLoopWithReductionAutoVecTC8
    exec_time:  1.9662 
command timed out: 1200 seconds without output running [b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/bin/python', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/bin/lnt', b'runtest', b'test-suite', b'--no-timestamp', b'--sandbox', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox', b'--test-suite', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/test-suite', b'--cc', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2.install/bin/clang', b'--cxx', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2.install/bin/clang++', b'--use-lit', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1/bin/llvm-lit', b'--build-tool-options', b'"-k"', b'--cmake-define=TEST_SUITE_FORTRAN:STRING=ON', b'--cmake-define=CMAKE_Fortran_COMPILER=/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2.install/bin/flang', b'--cppflags', b'-mcpu=neoverse-512tvb -msve-vector-bits=256 -mllvm -treat-scalable-fixed-error-as-warning=false -O3', b'--threads=32', b'--build-threads=32'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2363.544419

```

</details>

https://github.com/llvm/llvm-project/pull/112959