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

[Vasileios Kalintiris]

Fix register usage for functions without dynamic stack allocation.

In functions without dynamic stack allocation we were using $fp for
referencing locals. However, in a function's body we have to use $fp only
for referencing inbound arguments and $sp for everything else. I added
some tests that would have caught this case.


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

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