Mark test-cpu-profiler/SampleWhenFrameIsNotSetup as flaky.

BUG=v8:3287
LOG=N
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/252493002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20930 ce2b1a6d-e550-0410-aec6-3dcde31c8c00