Ensure that external pixel arrays use a byte register in Crankshaft.

src/ia32/lithium-ia32.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1986 matching lines @@
                                         array_type != kExternalDoubleArray)) ||
       (representation.IsDouble() && (array_type == kExternalFloatArray ||
                                      array_type == kExternalDoubleArray)));
   ASSERT(instr->external_pointer()->representation().IsExternal());
   ASSERT(instr->key()->representation().IsInteger32());
 
   LOperand* external_pointer = UseRegister(instr->external_pointer());
   LOperand* key = UseRegisterOrConstant(instr->key());
   LOperand* val = NULL;
   if (array_type == kExternalByteArray ||
-      array_type == kExternalUnsignedByteArray) {
+      array_type == kExternalUnsignedByteArray ||
+      array_type == kExternalPixelArray) {
     // We need a byte register in this case for the value.
     val = UseFixed(instr->value(), eax);
   } else {
     val = UseRegister(instr->value());
   }
 
   return new LStoreKeyedSpecializedArrayElement(external_pointer,
                                                 key,
                                                 val);
 }
@@ skipping 233 matching lines @@
   LOperand* key = UseOrConstantAtStart(instr->key());
   LOperand* object = UseOrConstantAtStart(instr->object());
   LIn* result = new LIn(key, object);
   return MarkAsCall(DefineFixed(result, eax), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32