[clang] [clang][DebugInfo] Add inlined subprogram metadata for compiler built-ins (PR #189969)

[Michael Buch via cfe-commits]

Michael137 wrote:

CC @delcypher who's done work on the "artificial frame" approach for the `-fbounds-safety` traps

Agree with @OCHyams that it'd be nice if there was an easier to maintain solution for deciding which builtin opt-in/out of this.

https://github.com/llvm/llvm-project/pull/189969