Merge pull request #1365 from suzukaze/refactor-using-REGEXP_CLASS

Refactor codes using REGEXP_CLASS define.

src/codegen.c

@@ -2064,7 +2064,7 @@ codegen(codegen_scope *s, node *tree, int val)
       char *p1 = (char*)tree->car;
       char *p2 = (char*)tree->cdr;
       int ai = mrb_gc_arena_save(s->mrb);
-      int sym = new_sym(s, mrb_intern(s->mrb, REGEXP_CLASS));
+      int sym = new_sym(s, mrb_intern2(s->mrb, REGEXP_CLASS, REGEXP_CLASS_CSTR_LEN));
       int off = new_lit(s, mrb_str_new(s->mrb, p1, strlen(p1)));
       int argc = 1;
 
@@ -2091,7 +2091,7 @@ codegen(codegen_scope *s, node *tree, int val)
     if (val) {
       node *n = tree->car;
       int ai = mrb_gc_arena_save(s->mrb);
-      int sym = new_sym(s, mrb_intern(s->mrb, REGEXP_CLASS));
+      int sym = new_sym(s, mrb_intern2(s->mrb, REGEXP_CLASS, REGEXP_CLASS_CSTR_LEN));
       int argc = 1;
       int off;
       char *p;

src/re.h

@@ -8,5 +8,6 @@
 #define RE_H
 
 #define REGEXP_CLASS          "Regexp"
+#define REGEXP_CLASS_CSTR_LEN 6
 
 #endif