[clang] [ASTMatchers] AST matcher support for ObjC pointers (PR #117021)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-armv8-quick` running on `linaro-clang-armv8-quick` while building `clang` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/154/builds/8421

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'Clangd Unit Tests :: ./ClangdTests/251/318' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/tools/clang/tools/extra/clangd/unittests/./ClangdTests-Clangd Unit Tests-149607-251-318.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=318 GTEST_SHARD_INDEX=251 /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/tools/clang/tools/extra/clangd/unittests/./ClangdTests
--

Note: This is test shard 252 of 318.
[==========] Running 4 tests from 4 test suites.
[----------] Global test environment set-up.
[----------] 1 test from CommandMangler
[ RUN      ] CommandMangler.Sysroot
[       OK ] CommandMangler.Sysroot (305 ms)
[----------] 1 test from CommandMangler (305 ms total)

[----------] 1 test from GlobalCompilationDatabaseTest
[ RUN      ] GlobalCompilationDatabaseTest.BuildDir
Failed to find compilation database for /clangd-test/x/foo.cc
Loaded compilation database from /clangd-test/x/build/compile_commands.json
Failed to find compilation database for /clangd-test/bar.cc
[       OK ] GlobalCompilationDatabaseTest.BuildDir (119 ms)
[----------] 1 test from GlobalCompilationDatabaseTest (119 ms total)

[----------] 1 test from CrossFileRenameTests
[ RUN      ] CrossFileRenameTests.WithUpToDateIndex
ASTWorker building file /clangd-test/foo.h version null with command 
[/clangd-test]
clang -xobjective-c++ /clangd-test/foo.h
Driver produced command: cc1 -cc1 -triple armv8a-unknown-linux-gnueabihf -fsyntax-only -disable-free -clear-ast-before-backend -main-file-name foo.h -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -target-cpu generic -target-feature +vfp2 -target-feature +vfp2sp -target-feature +vfp3 -target-feature +vfp3d16 -target-feature +vfp3d16sp -target-feature +vfp3sp -target-feature +fp16 -target-feature +vfp4 -target-feature +vfp4d16 -target-feature +vfp4d16sp -target-feature +vfp4sp -target-feature +fp-armv8 -target-feature +fp-armv8d16 -target-feature +fp-armv8d16sp -target-feature +fp-armv8sp -target-feature -fullfp16 -target-feature +fp64 -target-feature +d32 -target-feature +neon -target-feature +sha2 -target-feature +aes -target-feature -fp16fml -target-abi aapcs-linux -mfloat-abi hard -debugger-tuning=gdb -fdebug-compilation-dir=/clangd-test -fcoverage-compilation-dir=/clangd-test -resource-dir lib/clang/20 -internal-isystem lib/clang/20/include -internal-isystem /usr/local/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -ferror-limit 19 -fno-signed-char -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fobjc-runtime=gcc -fobjc-encode-cxx-class-template-spec -fobjc-exceptions -fcxx-exceptions -fexceptions -no-round-trip-args -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -x objective-c++ /clangd-test/foo.h
Building first preamble for /clangd-test/foo.h version null
not idle after addDocument
UNREACHABLE executed at ../llvm/clang-tools-extra/clangd/unittests/SyncAPI.cpp:22!
Built preamble of size 414568 for file /clangd-test/foo.h version null in 12.26 seconds
indexed preamble AST for /clangd-test/foo.h version null:
  symbol slab: 0 symbols, 68 bytes
  ref slab: 0 symbols, 0 refs, 72 bytes
  relations slab: 0 relations, 12 bytes
#0 0x016a4018 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/tools/clang/tools/extra/clangd/unittests/./ClangdTests+0xb82018)
#1 0x016a19ec llvm::sys::RunSignalHandlers() (/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/tools/clang/tools/extra/clangd/unittests/./ClangdTests+0xb7f9ec)
#2 0x016a48ec SignalHandler(int) Signals.cpp:0:0
#3 0xf765d6e0 __default_sa_restorer ./signal/../sysdeps/unix/sysv/linux/arm/sigrestorer.S:67:0
#4 0xf764db06 ./csu/../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47:0
#5 0xf768d292 __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#6 0xf765c840 gsignal ./signal/../sysdeps/posix/raise.c:27:6

--
exit: -6
--
shard JSON output does not exist: /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/tools/clang/tools/extra/clangd/unittests/./ClangdTests-Clangd Unit Tests-149607-251-318.json
********************


```

</details>

https://github.com/llvm/llvm-project/pull/117021