[clang] [clang] Warn when builtin names are used outside of invocations (PR #96097)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

@zygoloid @cor3ntin @AaronBallman in the light of new data in https://github.com/llvm/llvm-project/pull/96097#issuecomment-2198314023, do you think this lex approach to revertible type trait identifiers is still viable?

https://github.com/llvm/llvm-project/pull/96097