[llvm] [NFC][DecoderEmitter] Arrange functions by class 1/N (PR #157107)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

FYI Filter/FilterChooser/DecoderTableBuilder will all be almost completely refactored, and I was thinking about splitting them in their own files. I don't mind regrouping them now though, but maybe do all that in one PR?


https://github.com/llvm/llvm-project/pull/157107