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Commit ce64eddb authored by Chris Lattner's avatar Chris Lattner
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- Two minor improvements to the MachineInstr class to reduce footprint and 

    overhead: Merge 3 parallel vectors into 1, change regsUsed hash_set to be a
    bitvector.  Sped up LLC a little less than 10% in a debug build!

llvm-svn: 4261
parent 51a2c3cc
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