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

[Samrudh Nelli via cfe-commits]

SamrudhNelli wrote:

Hi @zwuis  @Fznamznon, thank you for your help in solving the issue!!
Since the PR is now approved, should I rebase and squash the branch?
If not, could you merge it when you have a moment, as I don’t have commit access to the repository? Thanks.

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