[PATCH] [mips] Add support for accessing $gp as a named register.

[Daniel Sanders]

Hi atanasyan, sstankovic, vmedic,

Mips Linux uses $gp to hold a pointer to thread info structure and accesses it
with a named register. This makes this work for LLVM.

The N32 ABI doesn't quite work yet since the frontend generates incorrect IR
for this case. It neglects to truncate the 64-bit GPR to a 32-bit value before
converting to a pointer. Given correct IR (as in the testcase in this patch),
it works correctly.

http://reviews.llvm.org/D6893

Files:
  lib/Target/Mips/MipsISelLowering.cpp
  lib/Target/Mips/MipsISelLowering.h
  test/CodeGen/Mips/named-register-n32.ll
  test/CodeGen/Mips/named-register-n64.ll
  test/CodeGen/Mips/named-register-o32.ll

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