Improve function lookup speed by working with raw objects only.

runtime/vm/stack_frame.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/stack_frame.h"
 
 #include "vm/assembler_macros.h"
 #include "vm/deopt_instructions.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 297 matching lines @@
     return func_.raw();
   }
   // Iterate over the deopt instructions and determine the inlined
   // functions if any and iterate over them.
   ASSERT(deopt_info_.Length() != 0);
   while (index_ < deopt_info_.Length()) {
     intptr_t cur_index = index_;
     index_ += 1;
     intptr_t deopt_instr = deopt_info_.Instruction(cur_index);
     ASSERT(deopt_instr != DeoptInstr::kRetBeforeAddress);
-    if ((deopt_instr == DeoptInstr::kRetAfterAddress)) {
+    if (deopt_instr == DeoptInstr::kRetAfterAddress) {
       intptr_t deopt_from_index = deopt_info_.FromIndex(cur_index);
       *pc = DeoptInstr::GetRetAfterAddress(deopt_from_index,
                                            object_table_,
                                            &func_);
       return func_.raw();
     }
   }
   index_ = -1;
   return Function::null();
 }
 
 }  // namespace dart