[PATCH] Cleanup register pressure calculation in MachineLICM

[Daniel Jasper]

Hi qcolombet,

There were four almost identical implementations of calculating/updating the register pressure for a certain MachineInstr. Cleanup to have a single implementation (well, actually two, as bool flag now controls whether or not RegSeen should be considered).

Not functional changes intended.

http://reviews.llvm.org/D8604

Files:
  lib/CodeGen/MachineLICM.cpp

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