Mark Lacey f1f9e88360 Cache expression types in failure diagnosis. ...

After we call into typeCheckExpression() we need to cache the
resulting types in the constraint system type map because we later
call into code that reads the types out of the type map.

Fixes rdar://problem/30376186 as well as a couple crashers.

2017-02-14 19:22:41 -08:00

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