[clang] [Clang][ASTMatcher] Improve matching isDerivedFrom base in case of multi aliases exists (PR #126793)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

This is a bit more in the weeds of AST matchers internals than what I'm familiar with, so I've added some other reviewers who have reviewed more extensive changes to this code based on code history.

https://github.com/llvm/llvm-project/pull/126793