Use lib conditional types for type facts if possible#22348

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weswigham wants to merge 4 commits intomicrosoft:mainfrom

weswigham:use-conditionals-while-narrowing

Commits on Mar 6, 2018

Use lib conditional types for type facts if possible
weswigham
committed

Commits on Mar 9, 2018

Fix bug in checker that created zero length intersections, try constraint based types
weswigham
committed

Commits on May 9, 2018