[Swift 3.0] diagnostics improvements #4642
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Explanation
Cherry-picks my changes for better diagnostics on operator declarations and contextual member references. For details please see examples in #4628 and #4540. @DougGregor reviewed both of these.
Scope
Minor reorganization of operator parsing. Other changes are diagnostics-only.
SR issue
none
Risk
Low; mostly diagnostics-related.
Testing
Added additional tests for changed & new diagnostics. As usual, verified existing tests.