Implement target cache for constructor calls.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index eeef0e94e84ba17d6c0063b76eb9cf15b0b637be..0689a31f829b28c3969db4fc4eab4241d184cb63 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -2271,9 +2271,22 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
   __ Set(rax, arg_count);
   __ movq(rdi, Operand(rsp, arg_count * kPointerSize));
 
-  Handle<Code> construct_builtin =
-      isolate()->builtins()->JSConstructCall();
-  __ Call(construct_builtin, RelocInfo::CONSTRUCT_CALL);
+  // Record call targets in unoptimized code, but not in the snapshot.
+  CallFunctionFlags flags;
+  if (!Serializer::enabled()) {
+    flags = RECORD_CALL_TARGET;
+    Handle<Object> uninitialized =
+        TypeFeedbackCells::UninitializedSentinel(isolate());
+    Handle<JSGlobalPropertyCell> cell =
+        isolate()->factory()->NewJSGlobalPropertyCell(uninitialized);
+    RecordTypeFeedbackCell(expr->id(), cell);
+    __ Move(rbx, cell);
+  } else {
+    flags = NO_CALL_FUNCTION_FLAGS;
+  }
+
+  CallConstructStub stub(flags);
+  __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
   context()->Plug(rax);
 }