[PATCH] [mips] [IAS] Add support for the DLA pseudo-instruction.

[Toma Tabacu]

Addressed review comments.
Changed behaviour to more closely match GAS.
Refactored if-else control flow to early returns.
Added test cases for DLA with $at as an operand.
Added more test cases for unusual behaviours of (D)LA.
Added test cases for mips-expansions-bad.s.
Removed some unnecessary generation checks to fix mips-expansions-bad.s.
Removed unnecessary patch dependecies.
Rebased on top of http://reviews.llvm.org/D10568.


http://reviews.llvm.org/D9524

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/Mips64InstrInfo.td
  test/MC/Mips/mips-expansions-bad.s
  test/MC/Mips/mips-expansions.s
  test/MC/Mips/mips64-expansions.s

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