Unflake cctest/test-cpu-profiler/JsNativeJsRuntimeJsSample on Win32 Debug

Profiler is now started from JavaScript. Since we always capture stack trace when starting profiler there should always be at least one expected sample in the profile.

Also changed ProfilerEventsProcessor::AddCurrentStack to make sure it call TickSample::Init to instead of custom initialization code.

BUG=v8:2920
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/25686011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17140 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Enable weak embedded objects in optimized code with a fix for heap verifier.

BUG=v8:2073
R=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/25702008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17141 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add column getter to CpuProfileNode

CpuProfileNode currently exposes only line number which is not enough for the cases when there is more than one function on the same line. This change exposes column number on CpuProfileNode.

BUG=302537
R=jkummerow@chromium.org, loislo@chromium.org

Review URL: https://codereview.chromium.org/25541003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17142 ce2b1a6d-e550-0410-aec6-3dcde31c8c00