Do a GC pass prior to collecting a heap profile.

It seems that doing an extra GC pass results in less cluttered heap snapshots.

Review URL: http://codereview.chromium.org/1949001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4580 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -3646,6 +3646,8 @@ void V8::ResumeProfilerEx(int flags, int tag) {
     // those modules which haven't been started prior to making a
     // snapshot.
 
+    // Make a GC prior to taking a snapshot.
+    i::Heap::CollectAllGarbage(false);
     // Reset snapshot flag and CPU module flags.
     flags &= ~(PROFILER_MODULE_HEAP_SNAPSHOT | PROFILER_MODULE_CPU);
     const int current_flags = i::Logger::GetActiveProfilerModules();