Mark Lacey fc73e79b74 Revert "Fix one source of exponential behavior in the type checker." ...

This reverts commit 1efafbcd9b because
results in a regression in source compatibility with Swift 3.

It also adds a test demonstrating what was broken by the change.

I will take another look at fixing the exponential behavior that this
was attempting to fix.

Fixes rdar://problem/29977523.

2017-01-15 22:33:57 -07:00

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