Support use of external strings as inputs to LoadCodeUnitsInstr.

runtime/vm/assembler_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"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
@@ skipping 2146 matching lines @@
   }
 }
 
 
 OperandSize Address::OperandSizeFor(intptr_t cid) {
   switch (cid) {
     case kArrayCid:
     case kImmutableArrayCid:
       return kWord;
     case kOneByteStringCid:
+    case kExternalOneByteStringCid:
       return kByte;
     case kTwoByteStringCid:
+    case kExternalTwoByteStringCid:
       return kHalfword;
     case kTypedDataInt8ArrayCid:
       return kByte;
     case kTypedDataUint8ArrayCid:
     case kTypedDataUint8ClampedArrayCid:
     case kExternalTypedDataUint8ArrayCid:
     case kExternalTypedDataUint8ClampedArrayCid:
       return kUnsignedByte;
     case kTypedDataInt16ArrayCid:
       return kHalfword;
@@ skipping 1294 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfFpuRegisters));
   return fpu_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM