SILGen: Fix issues with types nested inside fully-concrete extensions #9860
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Add a new version of TypeConverter::getEffectiveGenericSignature()
which takes a DeclContext, which uses the same logic as the
AnyFunctionRef version, and use it when computing lowered types
for destructors, stored property initializers and ivar destroyers.
Also, canonicalize the interface type of 'Self' as part of building
these types, to fold away concrete generic parameters.
Fixes rdar://problem/32120987.