[clang] [Clang] Handle consteval expression in array bounds expressions (PR #66222)

[Timm Baeder via cfe-commits]

tbaederr wrote:

@hazohelet Does this collide or intersect with the work wrt. (un)evaluated contexts in https://reviews.llvm.org/D155064 ?

https://github.com/llvm/llvm-project/pull/66222