Support profiling based on linux kernel performance events.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 23bfbd807d8d1430e4e38c3dc9044c41652dfe3f..167e7a93b1cfab03670607003b9593259ebcf27c 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -685,6 +685,10 @@ void Heap::UpdateSurvivalRateTrend(int start_new_space_size) {
 void Heap::PerformGarbageCollection(GarbageCollector collector,
                                     GCTracer* tracer,
                                     CollectionPolicy collectionPolicy) {
+  if (collector != SCAVENGER) {
+    PROFILE(CodeMovingGCEvent());
+  }
+
   VerifySymbolTable();
   if (collector == MARK_COMPACTOR && global_gc_prologue_callback_) {
     ASSERT(!allocation_allowed_);