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

[Kunal Dubey via cfe-commits]

xakep8 wrote:

@andykaylor  I've raised another PR for the lowering of __builtin_stdc_tailing_zeros https://github.com/llvm/llvm-project/pull/214931

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