vm_insnhelper.c (vm_check_if_namespace): tiny size reduction

Take advantage of "%+" modifier in the format string instead of
explicitly calling rb_inspect to reduce object size.

On x86 32-bit:

           text    data     bss     dec     hex filename
before: 2949572   12448   30680 2992700  2daa3c miniruby
after:  2949464   12448   30680 2992592  2da9d0 miniruby

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53644 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sun Jan 24 19:34:23 2016  Eric Wong  <e@80x24.org>
+
+	* vm_insnhelper.c (vm_check_if_namespace): tiny size reduction
+
 Sun Jan 24 18:12:36 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* common.mk: Simplifying Unicode data file download logic to make

vm_insnhelper.c

@@ -643,11 +643,8 @@ vm_get_const_base(const VALUE *ep)
 static inline void
 vm_check_if_namespace(VALUE klass)
 {
-    VALUE str;
     if (!RB_TYPE_P(klass, T_CLASS) && !RB_TYPE_P(klass, T_MODULE)) {
-	str = rb_inspect(klass);
-	rb_raise(rb_eTypeError, "%s is not a class/module",
-		 StringValuePtr(str));
+	rb_raise(rb_eTypeError, "%+"PRIsVALUE" is not a class/module", klass);
     }
 }