[X86] Early out of combineInsertSubvector for mask vectors.

Description

[X86] Early out of combineInsertSubvector for mask vectors.

The combines here shouldn't be done for mask vectors, but it wasn't clear anything was preventing that.

Details

Committed
ctopperAug 12 2017, 3:33 PM
Parents
rL310785: [X86] Fix bad comment. NFC
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