[clang-tools-extra] [Clang-Tidy] Handle nested-name-specifier in "llvm-prefer-isa-or-dyn-cast-in-conditionals" (PR #155982)

[Congcong Cai via cfe-commits]

https://github.com/HerrCai0907 approved this pull request.

LGTM.
since you have already changing the matcher a lot. could you give more meaningful name for each locals. e.g. Any, Condition, ...

https://github.com/llvm/llvm-project/pull/155982