New Heap profiler: add dumping HeapNumbers and InternalFields to snapshot.

New Heap profiler: add dumping HeapNumbers and InternalFields to snapshot.

HeapNumbers do consume memory, so it's worth dumping them. However, we
don't dump their values, as they are not as self-descriptive as values
of strings, and they will increase snapshot size. Storing heap numbers
values can be added if we will feel a sufficient demand for that.

InternalFields are used, e.g. for storing references to DOM nodes
event handlers.

Committed: http://code.google.com/p/v8/source/detail?r=5635

[Søren Thygesen Gjesse, 2010-10-18 07:38:39]

LGTM