re-exported synthesized extensions need to go under the base module #59129
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Resolves rdar://93928003
When a module adds a type as an extension of a foreign type, then a different module re-exports that module, the synthesized symbols currently get sorted incorrectly. The check that determines what module's graph they go in incorrectly uses the module of the decl, instead of the root module that the symbol is extending. This PR changes that check, so that modules in the aforementioned situation don't incorrectly receive symbols that can't be matched up with their parent.