[PATCH] [mips] [IAS] Improve support for the LI/DLI pseudo-instructions.

[Toma Tabacu]

Hi dsanders,

Changed emission of two consecutive DSLL's of 16 into one DSLL32 of 0,
changed helper function to take the shift amount as an argument and to avoid emitting an ORi if the immediate is 0,
improved error reporting,
made the code clearer, rewrote some comments,
and rewrote a couple of tests.

http://reviews.llvm.org/D8607

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

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