[Strings] StringGathering: Handle uses of strings before their definitions (#7008)

When we gather strings, we create new globals for each one, that is then
the canonical defining global for it, which will then be used everywhere
else. We create such a global if we lack one, but if we happen to have such
a global - a global that simply defines a string - then we reuse it. But we
didn't handle the case where there was a use before the definition, and
failed to sort the definition before the use.

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