Improve type checking, remove unused stub (removed also in x64 in preparation of porting the better…

runtime/vm/stub_code_arm.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"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/stub_code.h"
 
 #define __ assembler->
@@ skipping 87 matching lines @@
 }
 
 void StubCode::GenerateBreakpointReturnStub(Assembler* assembler) {
   __ Unimplemented("BreakpointReturn stub");
 }
 
 void StubCode::GenerateBreakpointDynamicStub(Assembler* assembler) {
   __ Unimplemented("BreakpointDynamic stub");
 }
 
-void StubCode::GenerateIsRawSubTypeStub(Assembler* assembler) {
-  __ Unimplemented("IsRawSubType Stub");
-}
-
 void StubCode::GenerateSubtype1TestCacheStub(Assembler* assembler) {
   __ Unimplemented("Subtype1TestCache Stub");
 }
 
 void StubCode::GenerateSubtype2TestCacheStub(Assembler* assembler) {
   __ Unimplemented("Subtype2TestCache Stub");
 }
 
 void StubCode::GenerateSubtype3TestCacheStub(Assembler* assembler) {
   __ Unimplemented("Subtype3TestCache Stub");
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM