digest: no ID cache

* ext/digest/*/*init.c: no need to cache interned IDs.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49561 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/digest/md5/md5init.c

@@ -40,6 +40,6 @@ Init_md5(void)
 
 #undef RUBY_UNTYPED_DATA_WARNING
 #define RUBY_UNTYPED_DATA_WARNING 0
-    rb_ivar_set(cDigest_MD5, rb_intern("metadata"),
-		Data_Wrap_Struct(0, 0, 0, (void *)&md5));
+    rb_iv_set(cDigest_MD5, "metadata",
+	      Data_Wrap_Struct(0, 0, 0, (void *)&md5));
 }

ext/digest/rmd160/rmd160init.c

@@ -40,6 +40,6 @@ Init_rmd160(void)
 
 #undef RUBY_UNTYPED_DATA_WARNING
 #define RUBY_UNTYPED_DATA_WARNING 0
-    rb_ivar_set(cDigest_RMD160, rb_intern("metadata"),
-		Data_Wrap_Struct(0, 0, 0, (void *)&rmd160));
+    rb_iv_set(cDigest_RMD160, "metadata",
+	      Data_Wrap_Struct(0, 0, 0, (void *)&rmd160));
 }

ext/digest/sha1/sha1init.c

@@ -40,6 +40,6 @@ Init_sha1(void)
 
 #undef RUBY_UNTYPED_DATA_WARNING
 #define RUBY_UNTYPED_DATA_WARNING 0
-    rb_ivar_set(cDigest_SHA1, rb_intern("metadata"),
-		Data_Wrap_Struct(0, 0, 0, (void *)&sha1));
+    rb_iv_set(cDigest_SHA1, "metadata",
+	      Data_Wrap_Struct(0, 0, 0, (void *)&sha1));
 }

ext/digest/sha2/sha2init.c

@@ -41,7 +41,7 @@ Init_sha2(void)
 
     rb_require("digest");
 
-    id_metadata = rb_intern("metadata");
+    id_metadata = rb_intern_const("metadata");
 
     mDigest = rb_path2class("Digest");
     cDigest_Base = rb_path2class("Digest::Base");