ASTPrinter: Fix generic signatures with requirements on outer parameters [5.1 08/28] #27105
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We incorrectly assumed that a requirement 'rooted' in an outer parameter
must be necessarily defined as part of the outer context's signature,
and thus we were skipping it when printing the 'where' clause of a
nested declaration or an extension of a nested type.
Instead, actually get the outer generic signature and filter requirements
that the outer signature satisfies.
Fixes rdar://problem/53769896, https://bugs.swift.org/browse/SR-11221.