Further expand parsing tests around yield in generator/arrow parameters

test/cctest/test-parsing.cc

 // Copyright 2012 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 6724 matching lines @@
     {"'use strict'; ((", ")=>{});"},
     {NULL, NULL}
   };
 
   const char* generator_context_data[][2] = {
     {"'use strict'; (function *g(", ") { });"},
     {"(function *g(", ") { });"},
     // Arrow function within generator has the same rules.
     {"'use strict'; (function *g() { (", ") => {} });"},
     {"(function *g() { (", ") => {} });"},
+    // And similarly for arrow functions in the parameter list.
+    {"'use strict'; (function *g(z = (", ") => {}) { });"},
+    {"(function *g(z = (", ") => {}) { });"},
     {NULL, NULL}
   };
 
   const char* parameter_data[] = {
     "x=yield",
     "x, y=yield",
     "{x=yield}",
     "[x=yield]",
 
     "x=(yield)",
@@ skipping 702 matching lines @@
     "for (const x = 0 in {});",
     "for (let x = 0 in {});",
     NULL
   };
   // clang-format on
 
   static const ParserFlag always_flags[] = {kAllowHarmonyForIn};
   RunParserSyncTest(context_data, error_data, kError, nullptr, 0, always_flags,
                     arraysize(always_flags));
 }