Slava Pestov 3f8ef30185 RequirementMachine: Preserve sugared generic params in getSuperclassBound() and getConcreteType() ...

This was manifesting as module interfaces printing generic parameters
as `τ_0_0` in some cases.

Note that the GSB has the same bug, so this test case will fail with
-requirement-machine=off. I don't plan on fixing the bug in the GSB
unless we need to.

Fixes rdar://problem/78977127.

2021-09-29 14:39:38 -04:00

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