[turbofan] Initial support for constructor call inlining.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 8c363d3e8b6e5c07bc03a8bdcf18d1c23a9fa93f..82e5e6fd691d35d3505a54f269a338116152f47b 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -456,7 +456,12 @@ void JSGenericLowering::LowerJSLoadDynamic(Node* node) {
 }
 
 
-void JSGenericLowering::LowerJSCreate(Node* node) { UNIMPLEMENTED(); }
+void JSGenericLowering::LowerJSCreate(Node* node) {
+  // TODO(4544): The duplication of the constructor function is only valid if
+  // actual constructor and original constructor coincide. Fix this!
+  node->InsertInput(zone(), 1, node->InputAt(0));  // Duplicate constructor.
+  ReplaceWithRuntimeCall(node, Runtime::kNewObject);
+}
 
 
 void JSGenericLowering::LowerJSCreateArguments(Node* node) {