[PATCH] [AArch64] Add support for dynamically aligning stack objects

[Kristof Beyls]

Thanks for the quick review and nice catches.
It's indeed better to use AND instead of BFI; the patch now does this. It also makes some of the logic a bit simpler - but doesn't reduce the number of instructions needed when a base pointer is also needed, which is when there are both VLAs and dynamically aligned local variables.
I've also added the asserts you indicated - indeed they are good to have.


http://reviews.llvm.org/D8876

Files:
  lib/Target/AArch64/AArch64FrameLowering.cpp
  lib/Target/AArch64/AArch64FrameLowering.h
  lib/Target/AArch64/AArch64RegisterInfo.cpp
  lib/Target/AArch64/AArch64RegisterInfo.h
  test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll

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