Kyle Butt 336c78fdbe CodeGen: BlockPlacement: Add comment about DenseMap Safety. ...

The use of a DenseMap in precomputeTriangleChains does not cause
non-determinism, even though it is iterated over, as the only thing the
iteration does is to insert entries into a new DenseMap, which is not iterated.
Comment only change.

llvm-svn: 300088

2017-04-12 18:30:32 +00:00

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