[clang] [llvm] [Clang][C++23] Core language changes from P1467R9 extended floating-point types and standard names. (PR #78503)

[Joshua Cranmer via llvm-commits]

https://github.com/jcranmer-intel commented:

I haven't fully reviewed this, but here's some comments to start with:

https://github.com/llvm/llvm-project/pull/78503