FIRST_WEAK_SLOT  6715 src/heap.cc            Context::kHeaderSize + Context::FIRST_WEAK_SLOT * kPointerSize);
FIRST_WEAK_SLOT   634 src/incremental-marking.cc   for (int idx = Context::FIRST_WEAK_SLOT;
FIRST_WEAK_SLOT  1379 src/mark-compact.cc     for (int idx = Context::FIRST_WEAK_SLOT;
FIRST_WEAK_SLOT  1994 src/profile-generator.cc     for (int i = Context::FIRST_WEAK_SLOT;