Don't EnsureHasInitialMap on non-constructors

src/crankshaft/hydrogen.cc

 // Copyright 2013 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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 11433 matching lines @@
         New<HCompareObjectEqAndBranch>(left, right);
     return ast_context()->ReturnControl(result, expr->id());
   }
 
   if (op == Token::INSTANCEOF) {
     // Check to see if the rhs of the instanceof is a known function.
     if (right->IsConstant() &&
         HConstant::cast(right)->handle(isolate())->IsJSFunction()) {
       Handle<JSFunction> constructor =
           Handle<JSFunction>::cast(HConstant::cast(right)->handle(isolate()));
-      if (!constructor->map()->has_non_instance_prototype()) {
+      if (constructor->IsConstructor() &&
+          !constructor->map()->has_non_instance_prototype()) {
         JSFunction::EnsureHasInitialMap(constructor);
         DCHECK(constructor->has_initial_map());
         Handle<Map> initial_map(constructor->initial_map(), isolate());
         top_info()->dependencies()->AssumeInitialMapCantChange(initial_map);
         HInstruction* prototype =
             Add<HConstant>(handle(initial_map->prototype(), isolate()));
         HHasInPrototypeChainAndBranch* result =
             New<HHasInPrototypeChainAndBranch>(left, prototype);
         return ast_context()->ReturnControl(result, expr->id());
       }
@@ skipping 2154 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8