[PATCH] MCJIT honor symbol visibility settings when populating the global symbol table

[Anthony Pesch]

I ran into the situation where I was loading multiple modules into the
same MCJIT instance, and needed it to honor symbol visibility settings
when populating the global symbol table.

I went the route of adding a new SymbolRef::SF_Exported flag, which
controls if a symbol is added to RuntimeDyld's internal
GlobalSymbolTable. I believe I've set this flag correctly for ELF
objects, but MachO was quite confusing to dig through. After doing a
quite a few test compiles and scanning through Apple's MachO reference
doc, it seems if N_PEXT is not set, the symbol is visible, but I'm not
entirely confident in that.

 - Anthony
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