Add missing break.

src/x64/full-codegen-x64.cc

 // Copyright 2009 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 1500 matching lines @@
       Condition is_smi = masm_->CheckSmi(result_register());
       __ j(is_smi, &smi);
       // Non-smi: call stub leaving result in accumulator register.
       __ CallStub(&stub);
       __ jmp(&done);
       // Perform operation directly on Smis.
       __ bind(&smi);
       __ SmiNot(result_register(), result_register());
       __ bind(&done);
       Apply(context_, result_register());
+      break;
     }
 
     default:
       UNREACHABLE();
   }
 }
 
 
 void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
   Comment cmnt(masm_, "[ CountOperation");
@@ skipping 354 matching lines @@
   __ movq(Operand(rsp, 0), rdx);
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal