Slava Pestov f3f9555c55 GSB: New implementation of getConformanceAccessPath() ...

A new implementation from "first principles". The idea is that
for a given conformance, we either have an explicit source
which forms the root of the requirement path, or a derived
source, which we 'factor' into a parent type/parent protocol
pair, and a requirement signature requirement.

We recursively compute the conformance access path of the
parent type and parent protocol, and append the path element
for the requirement.

This fixes a long-standing crasher, and eliminates two hacks,
the 'usesRequirementSource' flag in RequirementSource, and
the 'HadAnyRedundantConstraints' flag in GenericSignatureBuilder.

Fixes https://bugs.swift.org/browse/SR-7371 / rdar://problem/39239511

2021-02-23 16:26:04 -05:00

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