Pavel Yaskevich 694023ac7c [Diagnostics] Centralize requirement failure impact assessment ...

Conformance requirements get their fixes attached directly where
other requirements have to use (for now) `repairFailure` mechanism.

Regardless of _how_ fixes get recorded there should be a single
way to assess impact of a particular requirement failure.

The rules are:

- If this is a requirement associated with an operator, impact
  is based on use of the type which failed the requirement;

- If this requirement is from conditional extension,
  it is considered a very high impact because failing such
  requirement makes referenced member de facto invisible.

Resolves: rdar://problem/55593998
Resolves: [SR-11491](https://bugs.swift.org/browse/SR-11491)

2019-09-26 12:13:06 -07:00

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