llvm-project

b5dbddd2 - [DAG] visitEXTRACT_SUBVECTOR - change fold helper methods to take operands instead of EXTRACT_SUBVECTOR node. NFC. (#138279)

[DAG] visitEXTRACT_SUBVECTOR - change fold helper methods to take operands instead of EXTRACT_SUBVECTOR node. NFC. (#138279) Call with the individual subvector type, source vector and index operands instead of the original EXTRACT_SUBVECTOR node. Some of these folds still assumed that EXTRACT_SUBVECTOR/INSERT_SUBVECTOR nodes could have variable indices, despite us moving to all constant indices some time ago - all of that code has now been simplified. I've moved the narrowExtractedVectorBinOp call higher up, but it won't affect fold order - it didn't rely on the peekThroughBitcasts call, and worked on BinOps, not BUILD_VECTOR/INSERT_SUBVECTOR nodes. Prep work to make it easier for more of these folds to work through BITCAST nodes.