[GSB] Hack the ordering of adding requirements for a signature.
[GSB] Hack the ordering of adding requirements for a signature.

This hack is papering over other issues in the generic signature
builder, where canonicalizing an existing generic signature---in which
we already know the specific associated type declarations---could
introduce "inferred" requirements, breaking the resulting requirement
signatures by producing too-short paths. By delaying same-type
requirements, we make this case less likely.

The correct solution is to eliminate
PotentialArchtype::getNestedType()'s injection of an inferred
requirement, but doing so requires a bit more surgery.

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