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

[Thurston Dang via cfe-commits]

thurstond wrote:

> Upon further reflection, with it being friday and EOD, I'm just going to revert (added auto-revert) here: https://github.com/llvm/llvm-project/pull/162920

Thanks for the quick revert!

> ANY feedback on how to repro/etc would be very much appreciated though, thats an error type i haven't seen before.

The buildbot can be reproduced with the instructions at https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild

replacing the example command with your revision and the relevant bot type (HWASan):
```
BUILDBOT_REVISION=6010df0402e2f5cca0ded446a70492dedc43ab7e llvm-zorg/zorg/buildbot/builders/sanitizers/buildbot_bootstrap_hwasan.sh
```
Note that HWASan requires an Arm machine.

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