process: changed var to const in internal/v8_prof_processor

PR-URL: #8619
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

lib/internal/v8_prof_processor.js

@@ -18,7 +18,7 @@ scriptFiles.forEach(function(s) {
   script += process.binding('natives')[s] + '\n';
 });
 
-var tickArguments = [];
+const tickArguments = [];
 if (process.platform === 'darwin') {
   tickArguments.push('--mac');
 } else if (process.platform === 'win32') {