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Commit 756d15ac authored by Evan Cheng's avatar Evan Cheng
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- Added zero_reg def to stand for register 0. 

- Added two variants of PredicateOperand: ImmutablePredicateOperand, whose predicate does not change after isel; PredicateDefOperand, which represent a predicate defintion operand.

llvm-svn: 37892
parent 07210843
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