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Commit ac51533b authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Simplify RegScavenger::forward a bit more. 

Verify that early clobber registers and their aliases are not used.

All changes to RegsAvailable are now done as a transaction so the order of
operands makes no difference.

The included test case is from PR4686. It has behaviour that was dependent on the order of operands.

llvm-svn: 78465
parent e3728265
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