[regexp] do not include irregexp interpreter by default.

src/regexp/regexp-macro-assembler-irregexp.cc

 // Copyright 2008-2009 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.
 
+#ifdef V8_INTERPRETED_REGEXP
+
 #include "src/regexp/regexp-macro-assembler-irregexp.h"
 
 #include "src/ast/ast.h"
 #include "src/regexp/bytecodes-irregexp.h"
 #include "src/regexp/regexp-macro-assembler.h"
 #include "src/regexp/regexp-macro-assembler-irregexp-inl.h"
 
-
 namespace v8 {
 namespace internal {
 
-#ifdef V8_INTERPRETED_REGEXP
-
 RegExpMacroAssemblerIrregexp::RegExpMacroAssemblerIrregexp(Isolate* isolate,
                                                            Vector<byte> buffer,
                                                            Zone* zone)
     : RegExpMacroAssembler(isolate, zone),
       buffer_(buffer),
       pc_(0),
       own_buffer_(false),
       advance_current_end_(kInvalidPC),
       isolate_(isolate) {}
 
@@ skipping 419 matching lines @@
   bool old_buffer_was_our_own = own_buffer_;
   Vector<byte> old_buffer = buffer_;
   buffer_ = Vector<byte>::New(old_buffer.length() * 2);
   own_buffer_ = true;
   MemCopy(buffer_.start(), old_buffer.start(), old_buffer.length());
   if (old_buffer_was_our_own) {
     old_buffer.Dispose();
   }
 }
 
-#endif  // V8_INTERPRETED_REGEXP
-
 }  // namespace internal
 }  // namespace v8
+
+#endif  // V8_INTERPRETED_REGEXP