Anna Thomas 5c07a4c5de [RuntimeUnroll] NFC: Add a profitability function for mutliexit loop ...

Separated out the profitability from the safety analysis for multiexit
loop unrolling. Currently, this is an NFC because profitability is true
only if the unroll-runtime-multi-exit is set to true (off-by-default).

This is to ease adding the profitability heuristic up for review at
D35380.

llvm-svn: 308753

2017-07-21 16:30:38 +00:00

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