Revert "Move precompilation-related flags to flags list."

runtime/lib/regexp.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 #include "vm/regexp_parser.h"
 #include "vm/regexp_assembler_ir.h"
 #include "vm/regexp_assembler_bytecode.h"
 #include "vm/thread.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, trace_irregexp);
+DECLARE_FLAG(bool, interpret_irregexp);
 
 
 DEFINE_NATIVE_ENTRY(JSSyntaxRegExp_factory, 4) {
   ASSERT(TypeArguments::CheckedHandle(arguments->NativeArgAt(0)).IsNull());
   GET_NON_NULL_NATIVE_ARGUMENT(String, pattern, arguments->NativeArgAt(1));
   GET_NON_NULL_NATIVE_ARGUMENT(
       Instance, handle_multi_line, arguments->NativeArgAt(2));
   GET_NON_NULL_NATIVE_ARGUMENT(
       Instance, handle_case_sensitive, arguments->NativeArgAt(3));
   bool ignore_case = handle_case_sensitive.raw() != Bool::True().raw();
@@ skipping 62 matching lines @@
 
   if (FLAG_interpret_irregexp) {
     return BytecodeRegExpMacroAssembler::Interpret(regexp, subject, start_index,
                                                    zone);
   }
 
   return IRRegExpMacroAssembler::Execute(regexp, subject, start_index, zone);
 }
 
 }  // namespace dart