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

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

I can't tell what you're trying to fix here.  Is this fixing a crash?  Or is the check redundant?  Or is it necessary for some followup change you want to make?

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