i think we need to copy out the internal fields when we iterate the weak
roots
and zap the handle, no?
maybe declare a new (bigger) node type that is used for phantom handles?
https://codereview.chromium.org/753553002/diff/1/src/global-handles.cc
File src/global-handles.cc (right):
https://codereview.chromium.org/753553002/diff/1/src/global-handles.cc#newcode635
src/global-handles.cc:635: *(node->location()) =
Smi::FromInt(kPhantomReferenceZap);
if you zap the handle here, how can you get to object() when you read
out the internal fields?
https://codereview.chromium.org/753553002/
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