any_hash: do not goto into a branch

I'm not necessarily against every goto in general, but jumping into a
branch is definitely a bad idea.  Better refactor.

hash.c

@@ -190,36 +190,35 @@ any_hash(VALUE a, st_index_t (*other_func)(VALUE))
     VALUE hval;
     st_index_t hnum;
 
-    if (SPECIAL_CONST_P(a)) {
+    switch (TYPE(a)) {
+      case T_SYMBOL:
 	if (STATIC_SYM_P(a)) {
             hnum = a >> (RUBY_SPECIAL_SHIFT + ID_SCOPE_SHIFT);
             hnum = rb_hash_start(hnum);
-            goto out;
         }
-	else if (FLONUM_P(a)) {
-	    /* prevent pathological behavior: [Bug #10761] */
-	    goto flt;
-	}
+        else {
+            hnum = RSYMBOL(a)->hashval;
+        }
+        break;
+      case T_FIXNUM:
+      case T_TRUE:
+      case T_FALSE:
+      case T_NIL:
 	hnum = rb_objid_hash((st_index_t)a);
-    }
-    else if (BUILTIN_TYPE(a) == T_STRING) {
+        break;
+      case T_STRING:
 	hnum = rb_str_hash(a);
-    }
-    else if (BUILTIN_TYPE(a) == T_SYMBOL) {
-	hnum = RSYMBOL(a)->hashval;
-    }
-    else if (BUILTIN_TYPE(a) == T_BIGNUM) {
+        break;
+      case T_BIGNUM:
 	hval = rb_big_hash(a);
 	hnum = FIX2LONG(hval);
-    }
-    else if (BUILTIN_TYPE(a) == T_FLOAT) {
-      flt:
+        break;
+      case T_FLOAT: /* prevent pathological behavior: [Bug #10761] */
 	hnum = rb_dbl_long_hash(rb_float_value(a));
-    }
-    else {
+        break;
+      default:
 	hnum = other_func(a);
     }
-  out:
 #if SIZEOF_LONG < SIZEOF_ST_INDEX_T
     if (hnum > 0)
 	hnum &= (unsigned long)-1 >> 2;