[PATCH] [mips] Teach the delay slot filler to remove needless KILL instructions.

[Vasileios Kalintiris]

Hi dsanders,

Previously, the presence of KILL instructions would block valid candidates
from filling a specific delay slot. With the elimination of the KILL
instructions, in the appropriate range, we are able to fill more slots and
keep the information from future def/use analysis consistent.

http://reviews.llvm.org/D7724

Files:
  lib/Target/Mips/MipsDelaySlotFiller.cpp
  test/CodeGen/Mips/delay-slot-kill.ll

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