Provide call counts for constructor calls, surface them as a vector IC.

src/ic/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ic/ic.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 457 matching lines @@
     case Code::LOAD_IC:
     case Code::KEYED_LOAD_IC:
     case Code::STORE_IC:
     case Code::KEYED_STORE_IC:
       return;
     case Code::COMPARE_IC:
       return CompareIC::Clear(isolate, address, target, constant_pool);
     case Code::COMPARE_NIL_IC:
       return CompareNilIC::Clear(address, target, constant_pool);
     case Code::CALL_IC:  // CallICs are vector-based and cleared differently.
+    case Code::CONSTRUCT_IC:
     case Code::BINARY_OP_IC:
     case Code::TO_BOOLEAN_IC:
       // Clearing these is tricky and does not
       // make any performance difference.
       return;
     default:
       UNREACHABLE();
   }
 }
 
@@ skipping 15 matching lines @@
   State state = nexus->StateFromFeedback();
 
   if (state != UNINITIALIZED && !feedback->IsAllocationSite()) {
     nexus->ConfigureUninitialized();
     // The change in state must be processed.
     OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, UNINITIALIZED);
   }
 }
 
 
+void ConstructIC::Clear(Isolate* isolate, Code* host, ConstructICNexus* nexus) {
+  // Determine our state.
+  Object* feedback = nexus->vector()->Get(nexus->slot());
+  State state = nexus->StateFromFeedback();
+
+  if (state != UNINITIALIZED && !feedback->IsAllocationSite()) {
+    nexus->ConfigureUninitialized();
+    // The change in state must be processed.
+    OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, UNINITIALIZED);
+  }
+}
+
+
 void LoadIC::Clear(Isolate* isolate, Code* host, LoadICNexus* nexus) {
   if (IsCleared(nexus)) return;
   State state = nexus->StateFromFeedback();
   nexus->ConfigurePremonomorphic();
   OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, PREMONOMORPHIC);
 }
 
 
 void StoreIC::Clear(Isolate* isolate, Address address, Code* target,
                     Address constant_pool) {
@@ skipping 2455 matching lines @@
     KeyedLoadICNexus nexus(vector, vector_slot);
     KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
     ic.UpdateState(receiver, key);
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
   }
 
   return *result;
 }
 }  // namespace internal
 }  // namespace v8