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Commit ae8027cc authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Add a BlockInfo::FirstDef field. 

This is either an invalid SlotIndex, or valno->def for the first value
defined inside the block. PHI values are not counted as defined inside
the block.

The FirstDef field will be used when estimating the cost of spilling
around a block.

llvm-svn: 136736
parent f047ff4f
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