Untangle some #include dependencies....

src/ast.h

 // Copyright 2006-2008 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 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_AST_H_
 #define V8_AST_H_
 
 #include "execution.h"
 #include "factory.h"
+#include "jsregexp.h"
+#include "jump-target.h"
 #include "runtime.h"
 #include "token.h"
 #include "variables.h"
-#include "macro-assembler.h"
-#include "jsregexp.h"
-#include "jump-target.h"
 
 namespace v8 {
 namespace internal {
 
 // The abstract syntax tree is an intermediate, light-weight
 // representation of the parsed JavaScript code suitable for
 // compilation to native code.
 
 // Nodes are allocated in a separate zone, which allows faster
 // allocation and constant-time deallocation of the entire syntax
@@ skipping 1705 matching lines @@
 #undef DEF_VISIT
 
  private:
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_