[PATCH] [AArch64] Select lower sub, abs pattern to sabd on AArch64

[Jyoti Allur]

Hi Karthik,
Your original diff had it right the first time.

sub	v0.4s, v0.4s, v1.4s =>  v0.4s - v1.4s and result of substract stored to v0.4s
abs	v0.4s, v0.4s

It should be  SABDv4i32 V128:$Rn, V128:$Rm.


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http://reviews.llvm.org/D6781

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