internal.h: fix LIKELY

* internal.h (LIKELY, UNLIKELY): inverted conditions generate
  wrong code.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

internal.h

@@ -25,8 +25,8 @@ extern "C" {
 
 /* likely */
 #if __GNUC__ >= 3
-#define LIKELY(x)   (__builtin_expect(!(x), 0))
+#define LIKELY(x)   (__builtin_expect(!!(x), 1))
-#define UNLIKELY(x) (__builtin_expect(!(x), 1))
+#define UNLIKELY(x) (__builtin_expect(!!(x), 0))
 #else /* __GNUC__ >= 3 */
 #define LIKELY(x)   (x)
 #define UNLIKELY(x) (x)