[llvm-branch-commits] [SPIRV][NewPM] Port SPIRVPreLegalizerCombiner (PR #219108)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/219108

Standard NewPM pass porting. We do need to move the rule config parsing
into being per MF, but this should not be a noticeable regression.