[PATCH] Add a callback to FunctionPass to enable skipping execution on a per-function basis

[Akira Hatanaka]

Hi echristo,

The callback function object enables the function pass to skip execution based on the per-function subtarget object. With this change, we can remove the code in the subclasses of TargetPassConfig that calls subtarget methods to decide if a pass should be added to the pass pipeline. I've only made changes to ARM's pass configuration, but other targets can be fixed the same way.

http://reviews.llvm.org/D8717

Files:
  include/llvm/CodeGen/Passes.h
  include/llvm/Pass.h
  lib/CodeGen/IfConversion.cpp
  lib/CodeGen/MachineInstrBundle.cpp
  lib/CodeGen/Passes.cpp
  lib/IR/Pass.cpp
  lib/Target/ARM/ARMTargetMachine.cpp
  lib/Target/ARM/Thumb2SizeReduction.cpp
  lib/Target/Hexagon/HexagonTargetMachine.cpp
  lib/Target/R600/AMDGPUTargetMachine.cpp
  lib/Transforms/Scalar/SimplifyCFGPass.cpp

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