Implement optimized unary ops for ia32 as well. Fix a crash in disassembler.

runtime/vm/intermediate_language_x64.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"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 1400 matching lines @@
     const Class& double_class =
       Class::ZoneHandle(Isolate::Current()->object_store()->double_class());
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(double_class));
     const ExternalLabel label(double_class.ToCString(), stub.EntryPoint());
     __ pushq(value);
     compiler->GenerateCall(instance_call()->token_index(),
                            instance_call()->try_index(),
                            &label,
                            PcDescriptors::kOther);
-    // Result is in EAX.
+    // Result is in RAX.
+    ASSERT(result != temp);
     __ movq(result, RAX);
     __ popq(temp);
     __ movsd(XMM0, FieldAddress(temp, Double::value_offset()));
     __ DoubleNegate(XMM0);
     __ movsd(FieldAddress(result, Double::value_offset()), XMM0);
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64