[clang] [llvm] [mlir] [LLVM][TableGen] Change SeachableTableEmitter to use const RecordKeeper (PR #110032)

[Rahul Joshi via cfe-commits]

jurahul wrote:

I have the fix for LIBC build failure in flight. Will commit once its approved (or when checks complete). Pre-commit builds do not seem to build this target.

https://github.com/llvm/llvm-project/pull/110032