A64: Fix compiler warning in r19444.

src/a64/macro-assembler-a64.cc

 // Copyright 2013 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 580 matching lines @@
 #ifdef DEBUG
         __ bind(&size_check);
 #endif
         // Patch the branch to point to the current position, and emit a branch
         // to the label.
         Instruction* veneer = reinterpret_cast<Instruction*>(pc_);
         RemoveBranchFromLabelLinkChain(branch, label, veneer);
         branch->SetImmPCOffsetTarget(veneer);
         b(label);
 #ifdef DEBUG
-        ASSERT(SizeOfCodeGeneratedSince(&size_check) <= kMaxVeneerCodeSize);
+        ASSERT(SizeOfCodeGeneratedSince(&size_check) <=
+               static_cast<uint64_t>(kMaxVeneerCodeSize));
         size_check.Unuse();
 #endif
 
         it_to_delete = it++;
         unresolved_branches_.erase(it_to_delete);
       } else {
         ++it;
       }
     }
   }
@@ skipping 4353 matching lines @@
   }
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64