Add support for WritableRegister policy in the register allocator.

runtime/vm/assembler_ia32_test.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/globals.h"
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/os.h"
 #include "vm/unit_test.h"
@@ skipping 1838 matching lines @@
   EXPECT_EQ(16, res);  // 16 bytes emitted.
 }
 
 
 // Called from assembler_test.cc.
 ASSEMBLER_TEST_GENERATE(StoreIntoObject, assembler) {
   __ pushl(CTX);
   __ movl(CTX, Address(ESP, 2 * kWordSize));
   __ movl(EAX, Address(ESP, 3 * kWordSize));
   __ movl(ECX, Address(ESP, 4 * kWordSize));
+  __ pushl(EAX);
   __ StoreIntoObject(ECX,
                      FieldAddress(ECX, GrowableObjectArray::data_offset()),
                      EAX);
+  __ popl(EAX);
   __ popl(CTX);
   __ ret();
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32