Philip Reames 67b71ad04a [DAG] Fold insert_subvector undef, (extract_subvector X, 0), 0 with non-matching types
We have an existing DAG combine for when an insert/extract subvector pair is entirely a nop, but we hadn't handled the case where the net result was either an insert or an extract (but not both). The transform is restricted to index = 0 to avoid having to adjust indices after the transform.

Differential Revision: https://reviews.llvm.org/D158201
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