[clang] [OpenACC] Sema changes for +*&|^ reduction combiner recipes (PR #162740)

[Thurston Dang via cfe-commits]

thurstond wrote:

I think this may have broken a buildbot (https://lab.llvm.org/buildbot/#/builders/55/builds/18467/steps/11/logs/stdio):

```
FAIL: Clang :: SemaOpenACC/loop-construct-reduction-clause.cpp (22104 of 91237)
******************** TEST 'Clang :: SemaOpenACC/loop-construct-reduction-clause.cpp' FAILED ********************
Exit Code: 134
Command Output (stderr):
--
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/22/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/SemaOpenACC/loop-construct-reduction-clause.cpp -fopenacc -verify # RUN: at line 1
+ /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/22/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/SemaOpenACC/loop-construct-reduction-clause.cpp -fopenacc -verify
libc++abi: Pure virtual function called!
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/SemaOpenACC/Output/loop-construct-reduction-clause.cpp.script: line 1: 3724937 Aborted                 /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -cc1 -internal-isystem /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/lib/clang/22/include -nostdsysteminc /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/SemaOpenACC/loop-construct-reduction-clause.cpp -fopenacc -verify
```


https://github.com/llvm/llvm-project/pull/162740