Select lower fsub,fabs pattern to fabd on AArch64
This patch lowers patterns such as- fsub v0.4s, v0.4s, v1.4s fabs v0.4s, v0.4s to fabd v0.4s, v0.4s, v1.4s on AArch64. Review: http://reviews.llvm.org/D6791 llvm-svn: 225169
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