[clang] [clang] Fix crashes when initializing constexpr int* with floating-point (PR #180376)

[Mariya Podchishchaeva via cfe-commits]

Fznamznon wrote:

@SamrudhNelli , could you please make your email associated with your account public per our policy https://llvm.org/docs/DeveloperPolicy.html#email-addresses ? Then I can merge it for you.

https://github.com/llvm/llvm-project/pull/180376