Craig Topper bbbb93eb48 Revert "[DAG] Fold insert_subvector undef, (extract_subvector X, 0), 0 with non-matching types"
This reverts commit 770be43f6782dab84d215d01b37396d63a9c2b6e.

Forgot to remove from my tree while experimenting.
2023-08-18 12:00:07 -07:00
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