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[AArch64] Guard Misaligned 128-bit store penalty by subtarget feature

Authored by mssimpso on Dec 15 2016, 10:36 AM.

Description

[AArch64] Guard Misaligned 128-bit store penalty by subtarget feature

This patch checks that the SlowMisaligned128Store subtarget feature is set
when penalizing such stores in getMemoryOpCost.

Differential Revision: https://reviews.llvm.org/D27677

llvm-svn: 289845