Drive-by comment: Hi Michael - In your JumpIfDictionaryInPrototypeChain()
you
read Map::kBitField2Offset with a word-load on all arch's. This field is not
word-aligned, so it probably takes some tiny, tiny amount longer to load
than if
you'd just read the byte. ldrb on arm, movzxbq on x64, and probably just
movb on
ia32. This is about as micro as micro-optimiztions get ;-) MIPS is allergic
to
unaligned loads, so we have to do this for our port.
https://codereview.chromium.org/35413006/
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