[clang] [Clang] prevent assertion failure by avoiding required literal type checking in C context (PR #101426)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman approved this pull request.

LGTM!

This seems like a pretty reasonable candidate to backport to 19.x as well: https://www.llvm.org/docs/GitHub.html#backporting-fixes-to-the-release-branches

https://github.com/llvm/llvm-project/pull/101426