Chris Lattner d6bd311506 Use a smallvector for inactiveCounts and initialize it lazily ...

instead of init'ing it maximally to zeros on entry.  getFreePhysReg
is pretty hot and only a few elements are typically used.  This speeds
up linscan by 5% on 176.gcc.

llvm-svn: 47631

2008-02-26 22:08:41 +00:00

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