[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 `flang-aarch64-debug-reverse-iteration` running on `linaro-flang-aarch64-debug-reverse-iteration` while building `clang,llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/20/builds/6559

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
91.600 [4/10/40] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_ftn_cdecl.cpp.o
91.832 [4/9/41] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_barrier.cpp.o
91.851 [4/8/42] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_affinity.cpp.o
93.684 [4/7/43] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_gsupport.cpp.o
94.051 [4/6/44] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/omp-icv.cpp.o
104.512 [4/5/45] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/omp-debug.cpp.o
104.980 [4/4/46] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/z_Linux_util.cpp.o
105.532 [3/4/47] Linking C shared library openmp/runtime/src/libomp.so
112.436 [3/3/48] Building CXX object openmp/tools/archer/CMakeFiles/archer.dir/ompt-tsan.cpp.o
112.828 [2/3/49] Linking CXX shared library openmp/tools/archer/libarcher.so
FAILED: openmp/tools/archer/libarcher.so 
: && /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/./bin/clang++ --target=aarch64-unknown-linux-gnu -fPIC -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -Wall -fcolor-diagnostics -Wcast-qual -Wformat-pedantic -Wimplicit-fallthrough -Wsign-compare -Wno-extra -Wno-pedantic -fno-semantic-interposition -fdata-sections -g  -Wl,-z,defs -Wl,-z,nodelete -fuse-ld=lld -Wl,--color-diagnostics -shared -Wl,-soname,libarcher.so -o openmp/tools/archer/libarcher.so openmp/tools/archer/CMakeFiles/archer.dir/ompt-tsan.cpp.o  -ldl && :
ld.lld: error: openmp/tools/archer/CMakeFiles/archer.dir/ompt-tsan.cpp.o:(.data.DW.ref.__gxx_personality_v0+0x0): unknown relocation (580) against symbol __gxx_personality_v0
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
113.900 [2/2/50] Building CXX object openmp/tools/archer/CMakeFiles/archer_static.dir/ompt-tsan.cpp.o
118.305 [2/1/51] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/TargetValue.cpp.o
ninja: build stopped: subcommand failed.
FAILED: runtimes/runtimes-stamps/runtimes-build /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/runtimes/runtimes-stamps/runtimes-build 
cd /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/runtimes/runtimes-bins && /usr/local/bin/cmake --build .
ninja: build stopped: subcommand failed.

```

</details>

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