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[X86] Add more extract subvector cost model tests for smaller element sizes and…

Authored by craig.topper on Aug 6 2019, 1:12 PM.

Description

[X86] Add more extract subvector cost model tests for smaller element sizes and smaller than 128-bit vectors.

With the switch to widening legalization, we need to a better
job of costing extractions of less than 128-bits.

llvm-svn: 368081