llvm-project

e953623f - [X86] combineX86ShuffleChainWithExtract - ensure subvector widening is at index 0 (#143009)

[X86] combineX86ShuffleChainWithExtract - ensure subvector widening is at index 0 (#143009) When peeking through insert_subvector(undef,sub,c) widening patterns we didn't ensure c == 0 Fixes #142995