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

[Samrudh Nelli via cfe-commits]

SamrudhNelli wrote:

@Fznamznon implemented the changes you suggested. Could you have a look at it now?
Would appreciate your feedback and approach on finalizing this.

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