Jakob Stoklund Olesen c14cf57ba9 Allow traces to enter nested loops. ...

This lets traces include the final iteration of a nested loop above the
center block, and the first iteration of a nested loop below the center
block.

We still don't allow traces to contain backedges, and traces are
truncated where they would leave a loop, as seen from the center block.

llvm-svn: 161003

2012-07-30 23:15:10 +00:00

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