[PATCH] [mips] Add support for dynamic stack realignment.

[Vasileios Kalintiris]

Hi dsanders,

With this change we are able to realign the stack dynamically, whenever it
contains objects with alignment requirements that are larger than the
alignment specified from the given ABI.

We have to use the $fp register as the frame pointer when we perform
dynamic stack realignment. In complex stack frames, with variably-sized
objects, we reserve additionally the callee-saved register $s7 as the
base pointer in order to reference locals.

http://reviews.llvm.org/D8633

Files:
  lib/Target/Mips/MipsFrameLowering.cpp
  lib/Target/Mips/MipsFrameLowering.h
  lib/Target/Mips/MipsRegisterInfo.cpp
  lib/Target/Mips/MipsRegisterInfo.h
  lib/Target/Mips/MipsSEFrameLowering.cpp
  lib/Target/Mips/MipsSERegisterInfo.cpp
  test/CodeGen/Mips/dynamic-stack-realignment.ll
  test/CodeGen/Mips/msa/frameindex.ll
  test/CodeGen/Mips/return-vector.ll

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