[PATCH] [AArch64] Generate vector signed/unsigned mul and mla/mls long

[Balaram Makam]

Hi mcrosier, t.p.northover, jmolloy, apazos, Jiangning, HaoLiu,

Dear Tim, Chad, Ana, Jiangning and Hao,

This is my first patch to the LLVM project.

We are seeing missed opportunities to generate widened mul/mla/mls in AArch64
ARM had an implementation that was ported to AArch64.

http://reviews.llvm.org/D5589

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/AArch64/AArch64InstrInfo.td
  test/CodeGen/AArch64/aarch64-smull.ll
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