Introduce a test of how much memory it takes to boot up V8.

Introduce a test of how much memory it takes to boot up V8.
Linux only at the moment, since it uses /proc.  Shows that
there is room for improvement, espcially on 64 bit.
Committed: http://code.google.com/p/v8/source/detail?r=10122

[Michael Starzinger, 2011-12-01 11:44:13]

LGTM (with a nit). I like tests.

http://codereview.chromium.org/8750001/diff/4001/test/cctest/test-mark-compac...
File test/cctest/test-mark-compact.cc (right):

http://codereview.chromium.org/8750001/diff/4001/test/cctest/test-mark-compac...
test/cctest/test-mark-compact.cc:535: #endif
Please add an "// __linux__" comment here.