ES6: Add support for Map/Set forEach

This implements MapIterator and SetIterator which matches
the same constructs in the ES6 spec. However, these 2
iterators are not exposed to user code yet. They are only
used internally to implement Map.prototype.forEach and
Set.prototype.forEach.

Each iterator has a reference to the OrderedHashTable where
it directly accesses the hash table's entries.

The OrderedHashTable has a reference to the newest iterator
and each iterator has a reference to the next and previous
iterator, effectively creating a double linked list.

When the OrderedHashTable is mutated (or replaced) all the
iterators are updated.

When the iterator iterates passed the end of the data table
it closes itself. Closed iterators no longer have a
reference to the OrderedHashTable and they are removed from
the double linked list. In the case of Map/Set forEach, we
manually call Close on the iterator in case an exception was
thrown so that the iterator never reached the end.

At this point the OrderedHashTable keeps all the non finished
iterators alive but since the only thing we currently expose
is forEach there are no unfinished iterators outside a forEach
call. Once we expose the iterators to user code we will need
to make the references from the OrderedHashTable to the
iterators weak and have some mechanism to close an iterator
when it is garbage collected.

BUG=1793,2323
LOG=Y
TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/240323003

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20823 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert "ES6: Add support for Map/Set forEach"

This reverts https://code.google.com/p/v8/source/detail?r=20823

It broke Windows builds. Will need to find a Windows try bot to figure
out why.

TBR=mstarzinger@chromium.org,arv@chromium.org

Review URL: https://codereview.chromium.org/238973011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20824 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Adjust memory limits.

- Introduce new constant: kBootCodeSizeMultiplier to handle the code size differences across the platforms.

- Increase memory limits due to larger code size on MIPS.

BUG=
R=danno@chromium.org, plind44@gmail.com

Review URL: https://codereview.chromium.org/234153002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20825 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove uses of MaybeObject in runtime.cc.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/240253003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20828 ce2b1a6d-e550-0410-aec6-3dcde31c8c00