[PATCH] [mips][microMIPS] Delay slot filler: Replace the microMIPS JR with the JRC

[Jozef Kolek]

Hi dsanders, zoran.jovanovic,

This patch adds functionality in MIPS delay slot filler such as if delay slot filler have to put NOP instruction into the delay slot of microMIPS JR instruction, then instead of emitting NOP this instruction is replaced by compact jump instruction JRC.

http://reviews.llvm.org/D7522

Files:
  lib/Target/Mips/MipsDelaySlotFiller.cpp
  test/CodeGen/Mips/longbranch.ll
  test/CodeGen/Mips/micromips-compact-jump.ll
  test/CodeGen/Mips/micromips-delay-slot-jr.ll

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