Avoid g$ in main modules where possible (#2721)

We realized it is not valid to do these f$, g$ optimizations in
main and side modules, as a symbol might appear in both (like
RTTI or a weak symbol). We do need one of the appearances
to "win". This does the g$ optimization in main modules only,
that is, if a global appears in a main module then we can avoid
a g$ import and instead compute its location directly in the
module, since we will "win" over other modules with the same
symbol anyhow.

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