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

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 if (node->opcode() == IrOpcode::kJSCallConstruct) {
+    CallConstructParameters p = CallConstructParametersOf(node->op());
+    if (p.feedback().IsValid()) {
+      ConstructICNexus nexus(p.feedback().vector(), p.feedback().slot());
+      calls = nexus.ExtractCallCount();
+    }
   }
 
   // ---------------------------------------------------------------------------
   // 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 34 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