Hal Finkel d61d4f80e6 Implement PPCInstrInfo::FoldImmediate ...

There are certain PPC instructions into which we can fold a zero immediate
operand. We can detect such cases by looking at the register class required
by the using operand (so long as it is not otherwise constrained).

llvm-svn: 178961

2013-04-06 19:30:30 +00:00

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