Don't EnsureHasInitialMap on non-constructors

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index e1cf7d808035bc4ac41a6187c2fdda76c7f60cc9..b5a2e52231c77d31b975e932e53d7dd08a0bf700 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -11451,7 +11451,8 @@ void HOptimizedGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
         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());