Remove --harmony-regexps flag

src/objects.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 16763 matching lines @@
         flag = JSRegExp::kIgnoreCase;
         break;
       case 'm':
         flag = JSRegExp::kMultiline;
         break;
       case 'u':
         if (!FLAG_harmony_unicode_regexps) return JSRegExp::Flags(0);
         flag = JSRegExp::kUnicode;
         break;
       case 'y':
-        if (!FLAG_harmony_regexps) return JSRegExp::Flags(0);
         flag = JSRegExp::kSticky;
         break;
       default:
         return JSRegExp::Flags(0);
     }
     // Duplicate flag.
     if (value & flag) return JSRegExp::Flags(0);
     value |= flag;
   }
   *success = true;
@@ skipping 2965 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8