llvm-project

720007e4 - [NFC] [SPIRV] Add SPIRVCombinerHelper and refactor pre legalizer combiner to use it (#162735)

[NFC] [SPIRV] Add SPIRVCombinerHelper and refactor pre legalizer combiner to use it (#162735) Lots of the code/structure was based off `AMDGPUCombinerHelper`, `AMDGPUPreLegalizerCombiner`, etc. Tasks completed: - Create new `SPIRVCombinerHelper` inheriting from `CombinerHelper` - Move combiner logic in `SPIRVPreLegalizerCombiner` to helper methods in `SPIRVCombinerHelper` - Update `SPIRVPreLegalizerCombiner` to use the new helper class - Simplify `applySPIRVDistance` code