[clang] [Clang][CodeGen] Loose the cast check when emitting builtins (PR #81669)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

(It feels a little weird that the types in the clang AST don't actually match the LLVM builtin, but I guess it's not likely to actually cause any issues.)

https://github.com/llvm/llvm-project/pull/81669