[PATCH] [mips] Expand JAL instructions when PIC is enabled.

[Toma Tabacu]

-We now emit a correct JALR instruction, which makes us unable to add the R_(MICRO)MIPS_JALR relocation after it.
This is fine because that relocation is just an optimization hint for the linker and is not needed for correctness.
This means that we don't need to implement that relocation any more.

-Added a FIXME which explains this situation.

-Made tests match with the changes mentioned above.

http://reviews.llvm.org/D6231

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  test/MC/Mips/expansion-jal-sym-pic-noreorder.s
  test/MC/Mips/expansion-jal-sym-pic-reorder.s
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