[clang] [CIR] Avoid folding non-integer constants as integer casts (PR #214551)

[Kunal Dubey via cfe-commits]

xakep8 wrote:

@andykaylor Should I also work on the addition of the builtins to the CIRGen? as that would be the long term fix for the NYI issue

https://github.com/llvm/llvm-project/pull/214551