Apply optimization after class-id propagation: instance calls without ICData are optimized by using…

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 2187 matching lines @@
   }
   return true;
 }
 
 
 RawFunction* Class::LookupFunction(const String& name) const {
   Isolate* isolate = Isolate::Current();
   ASSERT(name.IsOneByteString());
   const OneByteString& lookup_name = OneByteString::Cast(name);
   Array& funcs = Array::Handle(isolate, functions());
+  if (funcs.IsNull()) {
+    // This can occur, e.g., for Null classes.
+    return Function::null();
+  }
   Function& function = Function::Handle(isolate, Function::null());
   OneByteString& function_name =
       OneByteString::Handle(isolate, OneByteString::null());
   intptr_t len = funcs.Length();
   for (intptr_t i = 0; i < len; i++) {
     function ^= funcs.At(i);
     function_name ^= function.name();
     if (function_name.EqualsIgnoringPrivateKey(lookup_name)) {
       return function.raw();
     }
@@ skipping 9983 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart