Jakob Stoklund Olesen fe6e07fd8a Use std::unique instead of a SmallPtrSet to ensure unique instructions in UseSlots. ...

This allows us to always keep the smaller slot for an instruction which is what
we want when a register has early clobber defines.

Drop the UsingInstrs set and the UsingBlocks map. They are no longer needed.

llvm-svn: 128886

2011-04-05 15:18:18 +00:00

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