benchmark: reduce code duplication

Merge duplicate case code in child-process-params.js.

PR-URL: #36568
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

benchmark/child_process/child-process-params.js

@@ -82,6 +82,7 @@ function main({ n, methodName, params }) {
       }
       break;
     case 'execFileSync':
+    case 'spawnSync':
       switch (params) {
         case 1:
           bench.start();
@@ -119,24 +120,5 @@ function main({ n, methodName, params }) {
           break;
       }
       break;
-    case 'spawnSync':
-      switch (params) {
-        case 1:
-          bench.start();
-          for (let i = 0; i < n; i++) method(command);
-          bench.end(n);
-          break;
-        case 2:
-          bench.start();
-          for (let i = 0; i < n; i++) method(command, args);
-          bench.end(n);
-          break;
-        case 3:
-          bench.start();
-          for (let i = 0; i < n; i++) method(command, args, options);
-          bench.end(n);
-          break;
-      }
-      break;
   }
 }