Slava Pestov 99d49f0ccb GSB: When rebuilding a signature, use the as-written requirements instead of the minimized ones ...

We rebuild a signature after dropping redundant conformance requirements,
since conformance requirements change the canonical type and conformance
access path computation.

When doing this, instead of using the canonical requirements from the
signature, use the original as-written requirements.

This fixes some weirdness around concrete same-type requirements.

There's a philosophical benefit here too -- since we rebuild the
signature without ever having built the old signature, we never create
an invalid GenericSignature in the ASTContext.

Fixes rdar://problem/75690903.

2021-03-25 17:35:52 -04:00

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