Add support for IncrementCounter in Hydrogen.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 57220e0de1e5cf77641235343b45aba12249cb8a..a9415465473068212a885e1f08ee66e21b034b5b 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -1021,6 +1021,22 @@ void HGraphBuilder::AddSoftDeoptimize(SoftDeoptimizeMode mode) {
 }
 
 
+void HGraphBuilder::AddIncrementCounter(StatsCounter* counter,
+                                        HValue* context) {
+  if (FLAG_native_code_counters && counter->Enabled()) {
+    HConstant* one = graph()->GetConstant1();
+    HConstant* zero = graph()->GetConstant0();
+    HValue* reference = Add<HConstant>(ExternalReference(counter));
+    HValue* old_value = AddExternalArrayElementAccess(
+        reference, zero, NULL, NULL, EXTERNAL_INT_ELEMENTS, false);
+    HValue* new_value = AddInstruction(
+        HAdd::New(zone(), context, old_value, one));
+    AddExternalArrayElementAccess(
+        reference, zero, new_value, NULL, EXTERNAL_INT_ELEMENTS, true);
+  }
+}
+
+
 HBasicBlock* HGraphBuilder::CreateBasicBlock(HEnvironment* env) {
   HBasicBlock* b = graph()->CreateBasicBlock();
   b->SetInitialEnvironment(env);