[NFC][TableGen] Reorganize GlobalISelMatchTable.h/.cpp (#200153) This file was a bit of a kitchen sink, and the implementation of the match table is sufficiently difficult to get comfortable with already. I spent the past few weeks looking at it, finding improvements, etc. and I think a nice way to make it a bit easier to approach is to split up the file a bit so that the main implementation (Matchers.h/.cpp) only contains the code pertaining to the Matchers (RuleMatchers, Preds, etc.). We now have 3 files: - One for type (LLT) related utilities. - One for the MatchTable emission logic, which is generic and should not be tied to any specific implementation. It just has the tools to emit the opcodes for the table. - One for the entire Matcher system, including PredicateMatchers and so on.
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