[clang] [clang] fix half && bfloat16 convert node expr codegen (PR #89051)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm approved this pull request.

LGTM. Would be good to verify the vector case is "correct" in as far as it's what GCC does 

https://github.com/llvm/llvm-project/pull/89051