[llvm] [clang] [clang-tools-extra] [Concepts] Traverse the instantiation chain for parameter injection inside a constraint scope (PR #79568)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

The failing libcxx test `libcxx/gdb/gdb_pretty_printer_test.sh.cpp` doesn't appear to relate to this patch, so I'm landing it anyway.

https://github.com/llvm/llvm-project/pull/79568