ruby.h: remove comment

* include/ruby/ruby.h (RB_GC_GUARD): remove comment unsupported by
  Solaris AS.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57621 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/ruby.h

@@ -538,7 +538,7 @@ static inline int rb_type(VALUE obj);
 #define RB_GC_GUARD(v) \
     (*__extension__ ({ \
 	volatile VALUE *rb_gc_guarded_ptr = &(v); \
-	__asm__("### RB_GC_GUARD("#v")" : : "m"(rb_gc_guarded_ptr)); \
+	__asm__("" : : "m"(rb_gc_guarded_ptr)); \
 	rb_gc_guarded_ptr; \
     }))
 #elif defined _MSC_VER