Don't EnsureHasInitialMap on non-constructors

src/compiler/js-typed-lowering.cc

 // Copyright 2014 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/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/linkage.h"
@@ skipping 1102 matching lines @@
 
   JSBinopReduction r(this, node);
   Node* effect = r.effect();
   Node* control = r.control();
 
   if (r.right_type()->IsConstant() &&
       r.right_type()->AsConstant()->Value()->IsJSFunction()) {
     Handle<JSFunction> function =
         Handle<JSFunction>::cast(r.right_type()->AsConstant()->Value());
     Handle<SharedFunctionInfo> shared(function->shared(), isolate());
-    if (!function->map()->has_non_instance_prototype()) {
+    if (function->IsConstructor() &&
+        !function->map()->has_non_instance_prototype()) {
       JSFunction::EnsureHasInitialMap(function);
       DCHECK(function->has_initial_map());
       Handle<Map> initial_map(function->initial_map(), isolate());
       this->dependencies()->AssumeInitialMapCantChange(initial_map);
       Node* prototype =
           jsgraph()->Constant(handle(initial_map->prototype(), isolate()));
 
       Node* if_is_smi = nullptr;
       Node* e_is_smi = nullptr;
       // If the left hand side is an object, no smi check is needed.
@@ skipping 1434 matching lines @@
 }
 
 
 CompilationDependencies* JSTypedLowering::dependencies() const {
   return dependencies_;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8