Andrew Trick c8bfd1d78f Convert -enable-sched-cycles and -enable-sched-hazard to -disable
flags. They are still not enable in this revision.

Added TargetInstrInfo::isZeroCost() to fix a fundamental problem with
the scheduler's model of operand latency in the selection DAG.

Generalized unit tests to work with sched-cycles.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123969 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-21 05:51:33 +00:00
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