Intrinsify Uint8ClampedArray's store and load indexed, inline load indexed.

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 1056 matching lines @@
       // Promote to double.
       __ cvtss2sd(result, locs()->out().xmm_reg());
     } else {
       ASSERT(class_id() == kFloat64ArrayCid);
       __ movsd(result, element_address);
     }
     return;
   }
 
   Register result = locs()->out().reg();
-  if (class_id() == kUint8ArrayCid) {
+  if ((class_id() == kUint8ArrayCid) ||
+      (class_id() == kUint8ClampedArrayCid)) {
     if (index.IsRegister()) {
       __ SmiUntag(index.reg());
     }
     __ movzxb(result, element_address);
     __ SmiTag(result);
     if (index.IsRegister()) {
       __ SmiTag(index.reg());  // Re-tag.
     }
     return;
   }
@@ skipping 1372 matching lines @@
 
 void ShiftMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64