Fix code for store buffer update on ARM and MIPS (link register was trashed).

runtime/vm/intrinsifier_x64.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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 171 matching lines @@
   __ movq(RAX, Address(RSP, + 3 * kWordSize));  // Array.
   Label fall_through;
   __ testq(RCX, Immediate(kSmiTagMask));
   __ j(NOT_ZERO, &fall_through);
   // Range check.
   __ cmpq(RCX, FieldAddress(RAX, Array::length_offset()));
   // Runtime throws exception.
   __ j(ABOVE_EQUAL, &fall_through);
   // Note that RBX is Smi, i.e, times 2.
   ASSERT(kSmiTagShift == 1);
-  // Destroy RCX as we will not continue in the function.
+  // Destroy RCX (ic data) as we will not continue in the function.
   __ StoreIntoObject(RAX,
                      FieldAddress(RAX, RCX, TIMES_4, Array::data_offset()),
                      RDX);
   // Caller is responsible of preserving the value if necessary.
   __ ret();
   __ Bind(&fall_through);
   return false;
 }
 
 
@@ skipping 1478 matching lines @@
   __ Bind(&fall_through);
   return false;
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64