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RequirementMachine: Fix -verify-generic-signatures mode to not violate invariants #41592

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slavapestov
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…achine invariants

We can't feed resolved DependentMemberTypes into the Requirement Machine
since that will trigger an assertion if there is a missing conformance.

Instead, copy and paste some logic from GenericSignatureBuilder.cpp to
'erase' resolved DependentMemberTypes into unresolved DependentMemberTypes.
@slavapestov
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@swift-ci Please smoke test

@slavapestov slavapestov merged commit 29ebb3d into swiftlang:main Mar 1, 2022
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