[do not merge] Try turning on MIR inliner by default#68213

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wesleywiser wants to merge 2 commits intorust-lang:masterfrom

wesleywiser:try_turning_on_inliner

Commits on Jan 13, 2020

Turn off const propagation of ref taking
wesleywiser
committed

Commits on Jan 14, 2020

Try turning on the inliner by default
wesleywiser
committed