[clang-tools-extra] [clang-tidy][mlir] Expand to cover pointer of builder (PR #159423)

[Jacques Pienaar via cfe-commits]

jpienaar wrote:

I don't know clang-tool processes well, I'm assuming you want a review from one of the regular contributors. But let me know if I should add regular LLVM project reviewer first.

https://github.com/llvm/llvm-project/pull/159423