hash.c: use ID_SCOPE_SHIFT

* hash.c (rb_any_hash): use ID_SCOPE_SHIFT instead of magic number.
  [Feature #9425]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45386 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -684,7 +684,7 @@ gc.$(OBJEXT): {$(VPATH)}gc.c $(RUBY_H_INCLUDES) {$(VPATH)}re.h \
   {$(VPATH)}gc.h {$(VPATH)}io.h {$(VPATH)}eval_intern.h {$(VPATH)}util.h \
   {$(VPATH)}internal.h {$(VPATH)}constant.h \
   {$(VPATH)}thread.h $(PROBES_H_INCLUDES) {$(VPATH)}vm_opts.h {$(VPATH)}debug.h
-hash.$(OBJEXT): {$(VPATH)}hash.c $(RUBY_H_INCLUDES) {$(VPATH)}util.h \
+hash.$(OBJEXT): {$(VPATH)}hash.c $(RUBY_H_INCLUDES) {$(VPATH)}util.h {$(VPATH)}id.h \
   $(ENCODING_H_INCLUDES) {$(VPATH)}internal.h $(PROBES_H_INCLUDES) {$(VPATH)}vm_opts.h
 inits.$(OBJEXT): {$(VPATH)}inits.c $(RUBY_H_INCLUDES) \
   {$(VPATH)}internal.h

hash.c

@@ -18,6 +18,7 @@
 #include "internal.h"
 #include <errno.h>
 #include "probes.h"
+#include "id.h"
 
 #ifdef __APPLE__
 # ifdef HAVE_CRT_EXTERNS_H
@@ -132,7 +133,7 @@ rb_any_hash(VALUE a)
 
     if (SPECIAL_CONST_P(a)) {
 	if (a == Qundef) return 0;
-	if (SYMBOL_P(a)) a >>= (RUBY_SPECIAL_SHIFT + 3); /* 3=ID_SCOPE_SHIFT */
+	if (SYMBOL_P(a)) a >>= (RUBY_SPECIAL_SHIFT + ID_SCOPE_SHIFT);
 	hnum = rb_objid_hash((st_index_t)a);
     }
     else if (BUILTIN_TYPE(a) == T_STRING) {