[PATCH] [AArch64] Select lower fsub, fabs pattern to fabd on AArch64

[Jyoti Allur]

Again, same comment as for other patch.

FABD Vd.<T>, Vn.<T>, Vm.<T> 
Subtracts the elements of Vm from the corresponding
elements of Vn, and places the absolute values of the results in the elements of Vd

Rm, Rn should swap thier places i think.
I was also thinking if we should have a more generic name for the testcase to cover all vector arithmetic instructions involving abs.
Would like to know what James and Tim's thoughts are on this.
LGTM, otherwise.


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  rL LLVM

http://reviews.llvm.org/D6791

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