Fix crashes of some CPU profiler tests on Windows after r16284

All the tests that started crashing create ProfilerEventsProcessor on the stack. After r16284 SamplingCircularQueue buffer is allocated as a field of the queue instead of separate heap object. This increased self size of ProfilerEventsProcessor by about 1Mb. Windows malloc fails to allocate such an object on the stack and crashes.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/23093022

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16287 ce2b1a6d-e550-0410-aec6-3dcde31c8c00