[clang] [ExprConstant] Handle shift overflow the same way as other kinds of overflow (PR #99579)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

I think I am bit surprised more tests are not affected by this change considering you modified the handling in several places. It seems we should be adding more test coverage with this change.

https://github.com/llvm/llvm-project/pull/99579