[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-global-isel` running on `linaro-clang-aarch64-global-isel` while building `clang,llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/125/builds/4087

<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 'Clang :: Interpreter/const.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 8: cat /home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/clang/test/Interpreter/const.cpp | /home/tcwg-buildbot/worker/clang-aarch64-global-isel/stage1/bin/clang-repl | /home/tcwg-buildbot/worker/clang-aarch64-global-isel/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/clang/test/Interpreter/const.cpp
+ cat /home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/clang/test/Interpreter/const.cpp
+ /home/tcwg-buildbot/worker/clang-aarch64-global-isel/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/clang/test/Interpreter/const.cpp
+ /home/tcwg-buildbot/worker/clang-aarch64-global-isel/stage1/bin/clang-repl
JIT session error: Unsupported aarch64 relocation:580: R_AARCH64_AUTH_ABS64
JIT session error: Failed to materialize symbols: { (main, { __clang_call_terminate, _ZN1AD1Ev, _ZN1AD2Ev }) }
error: Failed to materialize symbols: { (main, { _ZL1a, _ZGVL1a, __orc_init_func.incr_module_18, $.incr_module_18.__inits.0 }) }
error: Failed to materialize symbols: { (main, { __orc_init_func.incr_module_18 }) }
JIT session error: Failed to materialize symbols: { (main, { _ZN1AD1Ev }) }
error: Failed to materialize symbols: { (main, { $.incr_module_23.__inits.0, __orc_init_func.incr_module_23 }) }
error: Failed to materialize symbols: { (main, { __orc_init_func.incr_module_23 }) }
JIT session error: Failed to materialize symbols: { (main, { _ZN1AD1Ev }) }
error: Failed to materialize symbols: { (main, { __orc_init_func.incr_module_25, $.incr_module_25.__inits.0 }) }
error: Failed to materialize symbols: { (main, { __orc_init_func.incr_module_25 }) }
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/clang/test/Interpreter/const.cpp:19:11: error: CHECK: expected string not found in input
// CHECK: A(1), this = [[THIS:.+]]
          ^
<stdin>:1:1: note: scanning from here

^

Input file: <stdin>
Check file: /home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/clang/test/Interpreter/const.cpp

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

Input was:
<<<<<<
          1:  
check:19     X error: no match found
>>>>>>

--

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

Step 13 (test-suite) failure: test (failure)
...
size..init_array: 16 
size..interp: 27 
size..note.ABI-tag: 32 
size..plt: 704 
size..rela.dyn: 2256 
size..rela.plt: 1008 
size..rodata: 5626 
size..text: 43040 
**********
NOEXE: test-suite :: MicroBenchmarks/Builtins/Int128/Builtins.test (1359 of 3429)
******************** TEST 'test-suite :: MicroBenchmarks/Builtins/Int128/Builtins.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/sandbox/build/MicroBenchmarks/Builtins/Int128/Builtins' is missing
********************
NOEXE: test-suite :: MicroBenchmarks/ImageProcessing/AnisotropicDiffusion/AnisotropicDiffusion.test (1360 of 3429)
******************** TEST 'test-suite :: MicroBenchmarks/ImageProcessing/AnisotropicDiffusion/AnisotropicDiffusion.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/sandbox/build/MicroBenchmarks/ImageProcessing/AnisotropicDiffusion/AnisotropicDiffusion' is missing
********************
NOEXE: test-suite :: MicroBenchmarks/ImageProcessing/BilateralFiltering/BilateralFilter.test (1361 of 3429)
******************** TEST 'test-suite :: MicroBenchmarks/ImageProcessing/BilateralFiltering/BilateralFilter.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/sandbox/build/MicroBenchmarks/ImageProcessing/BilateralFiltering/BilateralFilter' is missing
********************
PASS: test-suite :: Bitcode/simd_ops/simd_ops_test_op_usubl_1310.test (1362 of 3429)
********** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_usubl_1310.test' RESULTS **********
compile_time: 0.0000 
exec_time: 0.0204 
hash: "53dc90a164c32a002d6398c06024a11e" 
link_time: 0.0862 
size: 82152 
size..bss: 3160 
size..comment: 206 
size..data: 264 
size..data.rel.ro: 1200 
size..dynamic: 528 
size..dynstr: 552 
size..dynsym: 1152 
size..eh_frame: 1412 
size..eh_frame_hdr: 340 
size..fini: 20 
size..fini_array: 40 
size..gnu.hash: 28 
size..gnu.version: 96 
size..gnu.version_r: 80 
size..got: 296 
size..got.plt: 360 
size..init: 24 
size..init_array: 16 
size..interp: 27 
size..note.ABI-tag: 32 
size..plt: 704 

```

</details>

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