Target feature runtime#2725

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gnzlbg wants to merge 8 commits intorust-lang:masterfrom

gnzlbg:target_feature_runtime

Commits on Jul 12, 2019

Initial commit: target-feature-runtime RFC
gnzlbg
committed

Commits on Jul 13, 2019

Add example, use non-exhaustive enum, constraints->use cases
gnzlbg
committed