[clang] [clang] Remove separate evaluation step for static class member init. (PR #142713)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

I think some of these examples are covered in the test suite but I am not sure if all are. Can you confirm this is consistent with: https://eel.is/c++draft/expr.const#28.5

https://github.com/llvm/llvm-project/pull/142713