[clang] Include [[clang::require_explicit_initialization]] warnings in system headers (PR #141133)

[Erich Keane via cfe-commits]

erichkeane wrote:

I think the unevaluated contexts DOES help a bunch, though I'm still concerned about the ability of the library to create 'temproary' objects/etc via some sort of default construction/aggregate construction, to then fill in the rest.



https://github.com/llvm/llvm-project/pull/141133