[clang] [clang-tools-extra] [Clang] Retain the angle loci for invented template parameters of constraints (PR #92104)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

Thanks for the review!

The Linux CI is green, so I presume so is the sluggish Windows CI. Landing it now.

https://github.com/llvm/llvm-project/pull/92104