[clang] [clang] Use CPlusPlus language option instead of Bool (PR #80975)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

The change in OpenCL behavior looks reasonable to me, but let's wait for @AnastasiaStulova to have a chance to weigh in.

I think we can skip a release note as this is *almost* an NFC change except for the OpenCL bits. We could put a release note under OpenCL for this if we wanted though.

The changes themselves LGTM barring feedback on OpenCL.

https://github.com/llvm/llvm-project/pull/80975