Doug Gregor dd3869739e [GSB] Don't add invalid concrete requirements. ...

When a concrete requirement is invalid due to the concrete type
lacking a conformance to a particular, required protocol, don't emit
that incorrect requirement---it causes invalid states further down the
line.

Fixes SR-5014 / rdar://problem/32402482.

While here, fix a comment that Huon noticed trailed off into oblivion.

2017-06-23 22:23:46 -07:00

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