Adds Uint32x4 add/sub for ARM.

runtime/vm/intermediate_language_arm.cc

 // Copyright (c) 2013, 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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 3800 matching lines @@
     }
     case Token::kBIT_OR: {
       __ vorrq(result, left, right);
       break;
     }
     case Token::kBIT_XOR: {
       __ veorq(result, left, right);
       break;
     }
     case Token::kADD:
-      UNIMPLEMENTED();
+      __ vaddqi(kWord, result, left, right);
       break;
     case Token::kSUB:
-      UNIMPLEMENTED();
+      __ vsubqi(kWord, result, left, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* MathUnaryInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
@@ skipping 808 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM