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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/29/builds/7663

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
4.571 [4/8/42] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/omp-debug.cpp.o
4.801 [4/7/43] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/z_Linux_util.cpp.o
4.975 [4/6/44] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_tasking.cpp.o
5.267 [4/5/45] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_dispatch.cpp.o
5.457 [3/5/46] Linking C shared library openmp/runtime/src/libomp.so
5.995 [3/4/47] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/omp-icv.cpp.o
7.391 [3/3/48] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/TargetValue.cpp.o
7.456 [2/3/49] Building CXX object openmp/tools/archer/CMakeFiles/archer_static.dir/ompt-tsan.cpp.o
7.503 [1/3/50] Linking CXX static library openmp/tools/archer/libarcher_static.a
7.532 [1/2/51] Linking CXX shared library openmp/libompd/src/libompd.so
FAILED: openmp/libompd/src/libompd.so 
: && /home/tcwg-buildbot/worker/flang-aarch64-rel-assert/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 -ffunction-sections -fdata-sections -Wall -fcolor-diagnostics -Wcast-qual -Wformat-pedantic -Wimplicit-fallthrough -Wsign-compare -Wno-extra -Wno-pedantic -fno-semantic-interposition -fdata-sections -std=c++11 -O3 -DNDEBUG  -Wl,-z,defs -Wl,-z,nodelete -shared -Wl,-soname,libompd.so -o openmp/libompd/src/libompd.so openmp/libompd/src/CMakeFiles/ompd.dir/TargetValue.cpp.o openmp/libompd/src/CMakeFiles/ompd.dir/omp-debug.cpp.o openmp/libompd/src/CMakeFiles/ompd.dir/omp-state.cpp.o openmp/libompd/src/CMakeFiles/ompd.dir/omp-icv.cpp.o   && :
/usr/bin/ld: openmp/libompd/src/CMakeFiles/ompd.dir/TargetValue.cpp.o: unrecognized relocation type 0x244 in section `.data.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]'
/usr/bin/ld: is this version of the linker - (GNU Binutils for Ubuntu) 2.38 - out of date ?
/usr/bin/ld: final link failed: bad value
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
7.591 [1/1/52] Building CXX object openmp/tools/archer/CMakeFiles/archer.dir/ompt-tsan.cpp.o
ninja: build stopped: subcommand failed.
FAILED: runtimes/runtimes-stamps/runtimes-build /home/tcwg-buildbot/worker/flang-aarch64-rel-assert/build/runtimes/runtimes-stamps/runtimes-build 
cd /home/tcwg-buildbot/worker/flang-aarch64-rel-assert/build/runtimes/runtimes-bins && /usr/local/bin/cmake --build .
ninja: build stopped: subcommand failed.

```

</details>

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