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

[Matt Arsenault via cfe-commits]

arsenm wrote:

> Sorry, I should have clearly mentioned that. Yes, it is for my followup change #80908. In #80908, we changed the type of LLVM builtin but kept the corresponding clang builtin unchanged to avoid breaking existing uses. 

Don't see how that could be related; you can losslessly bitconvert between i16 and bfloat 




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