Logically, I think LeftTrimFixedArray and RightTrimFixedArray should be
part of
FixedArrayBase. But they shouldn't access GC internals from there. You could
make TrimObjectStart and TrimObjectEnd helper methods which are in heap and
they
take care of free space filler creation, mark bits, live bytes count, and
maybe
also heap profiler (depending how general they should be - the more general
the
better). These helpers can be called from other places in object.cc as well,
i.e. all places that call CreateFillerObjectAt, which would result in a
larger
dependency cleanup. WDYT?
https://codereview.chromium.org/200443004/
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