Eliminate RawObject::class_ field entirely.

runtime/vm/opt_code_generator_ia32.cc

 // Copyright (c) 2011, 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/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/opt_code_generator.h"
 
 #include "vm/assembler_macros.h"
@@ skipping 2731 matching lines @@
 bool OptimizingCodeGenerator::TryInlineStaticCall(StaticCallNode* node) {
   Recognizer::Kind recognized = Recognizer::RecognizeKind(node->function());
   if (false && recognized == Recognizer::kMathSqrt) {
     Label smi_to_double, call_method, done;
     __ movl(EAX, Address(ESP, 0));
     CheckIfDoubleOrSmi(EAX, EBX, &smi_to_double, &call_method);
     __ movsd(XMM1, FieldAddress(EAX, Double::value_offset()));
     __ sqrtsd(XMM0, XMM1);
     AssemblerMacros::TryAllocate(assembler_,
                                  double_class_,
-                                 EBX,  // Class register.
                                  &call_method,
                                  EAX);  // Result register.
     __ movsd(FieldAddress(EAX, Double::value_offset()), XMM0);
     __ jmp(&done);
     __ Bind(&smi_to_double);
     __ Bind(&call_method);
     __ LoadObject(ECX, node->function());
     __ LoadObject(EDX, ArgumentsDescriptor(node->arguments()->length(),
                                            node->arguments()->names()));
     GenerateCall(node->token_index(), &StubCode::CallStaticFunctionLabel(),
@@ skipping 125 matching lines @@
     }
   }
   // TODO(srdjan): Implement unary kSUB (negate) Mint.
   CodeGenerator::VisitUnaryOpNode(node);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32