[PATCH] [AArch64]Add support to copy Q register tuples QPair, QTriple, QQuad in copyPhyReg

[Hao Liu]

  Hi Tim,

  As my mistake, this is conflict with http://llvm-reviews.chandlerc.com/D2473. I should attach this patch to D2473.

  This patch only copy Q tuples such as QPair/QTriple/QQuad. I fail to generate test cases for D tuples such as DPair/DTriple/DQuad, which I think may have copy situation in copyPhyReg.

  I'm a little confused if we should commit this patch or the patch in http://llvm-reviews.chandlerc.com/D2473, which may have unnecessary code for D tuples if this is no DPair/DTriple/DQuad copy.

  Thanks,
  -Hao

http://llvm-reviews.chandlerc.com/D2479