[patch][dragonegg] Fix c/InternFunctionWeakref.c

[Rafael Espíndola]

The test is failing currently when building with gcc 4.8. It looks
like weakrefs are reachable via emit_cgrah_aliases and
emit_cgraph_weakref. This causes us to try to use rauw twice, causing
an assert when we get a this->rauw(this).

The patch simply skips weakrefs in emit_cgrah_aliases.

Cheers,
Rafael
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