Add Polly support#50044

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DiamondLovesYou wants to merge 1 commit intorust-lang:masterfrom

DiamondLovesYou:polly

Commits on May 2, 2018

Add Polly support. Use can be triggered via `-Z polly`, when `rustc` uses an LLVM which includes polly.
DiamondLovesYou
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