[clang] [llvm] [PAC][ELF][AArch64] Support signed personality function pointer (PR #113148)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve-vla` running on `linaro-g3-02` while building `clang,llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/17/builds/4510

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

```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'AddressSanitizer-Unit :: ./Asan-aarch64-inline-Noinst-Test/failed_to_discover_tests_from_gtest' FAILED ********************

********************

Step 13 (test-suite) failure: test (failure)
...
size..init_array: 16 
size..interp: 27 
size..note.ABI-tag: 32 
size..plt: 944 
size..rela.dyn: 2424 
size..rela.plt: 1368 
size..rodata: 23172 
size..text: 669536 
**********
NOEXE: test-suite :: MicroBenchmarks/Builtins/Int128/Builtins.test (7927 of 9995)
******************** TEST 'test-suite :: MicroBenchmarks/Builtins/Int128/Builtins.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/test/sandbox/build/MicroBenchmarks/Builtins/Int128/Builtins' is missing
********************
NOEXE: test-suite :: MicroBenchmarks/ImageProcessing/AnisotropicDiffusion/AnisotropicDiffusion.test (7928 of 9995)
******************** TEST 'test-suite :: MicroBenchmarks/ImageProcessing/AnisotropicDiffusion/AnisotropicDiffusion.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/test/sandbox/build/MicroBenchmarks/ImageProcessing/AnisotropicDiffusion/AnisotropicDiffusion' is missing
********************
NOEXE: test-suite :: MicroBenchmarks/ImageProcessing/Blur/blur.test (7929 of 9995)
******************** TEST 'test-suite :: MicroBenchmarks/ImageProcessing/Blur/blur.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/test/sandbox/build/MicroBenchmarks/ImageProcessing/Blur/blur' is missing
********************
NOEXE: test-suite :: MicroBenchmarks/ImageProcessing/BilateralFiltering/BilateralFilter.test (7930 of 9995)
******************** TEST 'test-suite :: MicroBenchmarks/ImageProcessing/BilateralFiltering/BilateralFilter.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/test/sandbox/build/MicroBenchmarks/ImageProcessing/BilateralFiltering/BilateralFilter' is missing
********************
NOEXE: test-suite :: MicroBenchmarks/ImageProcessing/Dilate/Dilate.test (7931 of 9995)
******************** TEST 'test-suite :: MicroBenchmarks/ImageProcessing/Dilate/Dilate.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/test/sandbox/build/MicroBenchmarks/ImageProcessing/Dilate/Dilate' is missing
********************
PASS: test-suite :: Fortran/gfortran/torture/execute/gfortran-torture-execute-torture__execute__test_slice_f90.test (7932 of 9995)
********** TEST 'test-suite :: Fortran/gfortran/torture/execute/gfortran-torture-execute-torture__execute__test_slice_f90.test' RESULTS **********
compile_time: 0.0000 
exec_time: 0.0007 
hash: "53b7e7dd2343d1b025abc7c5aa14b40b" 
link_time: 0.0000 
size: 832264 
size..bss: 176 
size..comment: 264 
size..data: 664 
size..data.rel.ro: 176 
size..dynamic: 496 
size..dynstr: 621 
size..dynsym: 1584 
size..eh_frame: 56072 
size..eh_frame_hdr: 8436 
size..fini: 20 
size..fini_array: 8 
size..gnu.hash: 28 
size..gnu.version: 132 

```

</details>

https://github.com/llvm/llvm-project/pull/113148