[clang] [Clang] Fix assertion "unsigned range includes negative?" in AnalyzeComparison during Sema of vector comparison with mismatched signed/unsigned types and __builtin_convertvector (PR #182627)

[Yutong Zhu via cfe-commits]

YutongZhuu wrote:

@shafik It had been a while, do we still want to wait on @ojhunt? 

https://github.com/llvm/llvm-project/pull/182627