Comment #2 on issue 3108 by [email protected]:
LCodeGen::DoForInCacheArray() have different deopt conditions on different
archs
https://code.google.com/p/v8/issues/detail?id=3108
The deopt test still differ for the x64 arch.
From a very quick look at the commit, it looks like the field is set to
Smi(0) if it is invalid, and to an array (so non-smi) if valid. If that's
the case it may have been implemented this way because the `testb`
instruction used for CheckSmi is more efficient than a `test reg, reg`.
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