Fix several minor issues with grokdump.py tool.

Fix several minor issues with grokdump.py tool.

This includes the following changes:
* Bring instance type mapping up to date.
* Enable loading of maps without available meta-map.
* Add missing IntSize() method.
* Fix reference to Code.CODE_ALIGNMENT_MASK.
* Add alignment checks for objects and maps.

R=vegorov@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=10344

[Vyacheslav Egorov (Chromium), 2012-01-04 08:45:34]

LGTM

http://codereview.chromium.org/9075003/diff/1/tools/grokdump.py
File tools/grokdump.py (right):

http://codereview.chromium.org/9075003/diff/1/tools/grokdump.py#newcode957
tools/grokdump.py:957: def FindMap(self, tagged_address):
One trick that might help to guess whether smth is map or not is maps alignment
--- it's bigger than alignment of normal objects.

[Michael Starzinger, 2012-01-05 14:26:29]

Added new patch set.

http://codereview.chromium.org/9075003/diff/1/tools/grokdump.py
File tools/grokdump.py (right):

http://codereview.chromium.org/9075003/diff/1/tools/grokdump.py#newcode957
tools/grokdump.py:957: def FindMap(self, tagged_address):
On 2012/01/04 08:45:35, Vyacheslav Egorov wrote:
> One trick that might help to guess whether smth is map or not is maps
alignment
> --- it's bigger than alignment of normal objects.

Done. I also added the alignment check for other heap objects.