[clang] [clang][TableGen] Migrate clang-tblgen to use const RecordKeeper (PR #107533)

[Rahul Joshi via cfe-commits]

jurahul wrote:

Fair enough. The formatting changes are unintentional (I just happened to touch code that was not compliant and clang-format did its thing). How about I split these per-file/per-emitter/related sets of emitters? I have been doing the same on LLVM side, just that for clang it was feasible do all of the changes in a single go.

https://github.com/llvm/llvm-project/pull/107533