[turbofan] Hook up construct call counts.

src/compiler/js-inlining-heuristic.cc

 // Copyright 2015 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/compiler/js-inlining-heuristic.h"
 
 #include "src/compiler.h"
 #include "src/compiler/node-matchers.h"
 #include "src/objects-inl.h"
 
@@ skipping 57 matching lines @@
   // Stop inlinining once the maximum allowed level is reached.
   int level = 0;
   for (Node* frame_state = NodeProperties::GetFrameStateInput(node, 0);
        frame_state->opcode() == IrOpcode::kFrameState;
        frame_state = NodeProperties::GetFrameStateInput(frame_state, 0)) {
     if (++level > FLAG_max_inlining_levels) return NoChange();
   }
 
   // Gather feedback on how often this call site has been hit before.
   int calls = -1;  // Same default as CallICNexus::ExtractCallCount.
-  // TODO(turbofan): We also want call counts for constructor calls.
   if (node->opcode() == IrOpcode::kJSCallFunction) {
     CallFunctionParameters p = CallFunctionParametersOf(node->op());
     if (p.feedback().IsValid()) {
       CallICNexus nexus(p.feedback().vector(), p.feedback().slot());
       calls = nexus.ExtractCallCount();
     }
+  } else {
+    DCHECK_EQ(IrOpcode::kJSCallConstruct, node->opcode());
+    CallConstructParameters p = CallConstructParametersOf(node->op());
+    if (p.feedback().IsValid()) {
+      int const extra_index =
+          p.feedback().vector()->GetIndex(p.feedback().slot()) + 1;
+      Handle<Object> feedback_extra(p.feedback().vector()->get(extra_index),
+                                    function->GetIsolate());
+      if (feedback_extra->IsSmi()) {
+        calls = Handle<Smi>::cast(feedback_extra)->value();
+      }
+    }
   }
 
   // ---------------------------------------------------------------------------
   // Everything above this line is part of the inlining heuristic.
   // ---------------------------------------------------------------------------
 
   // In the general case we remember the candidate for later.
   candidates_.insert({function, node, calls});
   return NoChange();
 }
@@ skipping 40 matching lines @@
            candidate.node->id(), candidate.calls,
            candidate.function->shared()->SourceSize(),
            candidate.function->shared()->ast_node_count(),
            candidate.function->shared()->DebugName()->ToCString().get());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8