[PATCH] [mips] [IAS] Fix using .cpsetup with local labels (PR22518).

[Toma Tabacu]

Hi dsanders,

Parse for an MCExpr instead of an Identifier and use the symbol for relocations, not just the symbol's name.

This fixes errors when using local labels in .cpsetup (PR22518).

http://reviews.llvm.org/D7697

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
  test/MC/Mips/cpsetup-bad.s
  test/MC/Mips/cpsetup.s

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