[PATCH] [mips] [IAS] Add support for the B{L, G}{T, E}(U) branch pseudo-instructions.

[Toma Tabacu]

Made expansions identical with GAS (will report mismatches as bugs in GAS):

  blt  $0, $0 now expands to bltz $zero
  ble  $0, $0 now expands to blez $zero
  bge  $0, $0 now expands to bgez $zero
  bgt  $0, $0 now expands to bgtz $zero
  bgtu $0, $0 now expands to bnez $zero

Renamed to avoid possible confusion with compact branches.
Added error test for using conditional branch pseudos after .set noat.
Committed suggested change as http://reviews.llvm.org/rL235601.
Rebased on top of new http://reviews.llvm.org/D8480.


http://reviews.llvm.org/D8537

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/MipsInstrInfo.td
  test/MC/Mips/branch-pseudos-bad.s
  test/MC/Mips/branch-pseudos.s

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