[X86] combineAddOfPMADDWD - add PMADDUBSW support
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backend:X86
missed-optimization
- Dominant language
- LLVM
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Description
combineAddOfPMADDWD can almost handle PMADDUBSW nodes, but might be assuming commutativity (PMADDUBSW doesn't have matching implicit sext so we need to be careful).
Add test coverage (including 256/512 support - see #223364) and rename to combineAddOfPMADD
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