[PATCH] D23159: [mips] MIPSR6 delay slot filler optimization.

[Simon Dardis via llvm-commits]

sdardis created this revision.
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For MIPSR6 targets, stop the delay slot filler from picking an instruction
that would expose a load to CTI hazard.

Filling delay slots with 'speculative' instructions is not required. Those cases
can be turned into compact branches to avoid unnecessarily increasing codesize.

Repository:
  rL LLVM

https://reviews.llvm.org/D23159

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

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