Use __builtin_clz whenever it is available

format.h

@@ -581,13 +581,6 @@ inline unsigned count_digits(uint64_t n) {
   unsigned t = (64 - FMT_BUILTIN_CLZLL(n | 1)) * 1233 >> 12;
   return t - (n < Data::POWERS_OF_10_64[t]) + 1;
 }
-# ifdef FMT_BUILTIN_CLZ
-// Optional version of count_digits for better performance on 32-bit platforms.
-inline unsigned count_digits(uint32_t n) {
-  uint32_t t = (32 - FMT_BUILTIN_CLZ(n | 1)) * 1233 >> 12;
-  return t - (n < Data::POWERS_OF_10_32[t]) + 1;
-}
-# endif
 #else
 // Fallback version of count_digits used when __builtin_clz is not available.
 inline unsigned count_digits(uint64_t n) {
@@ -606,6 +599,14 @@ inline unsigned count_digits(uint64_t n) {
 }
 #endif
 
+#ifdef FMT_BUILTIN_CLZ
+// Optional version of count_digits for better performance on 32-bit platforms.
+inline unsigned count_digits(uint32_t n) {
+  uint32_t t = (32 - FMT_BUILTIN_CLZ(n | 1)) * 1233 >> 12;
+  return t - (n < Data::POWERS_OF_10_32[t]) + 1;
+}
+#endif
+
 // Formats a decimal unsigned integer value writing into buffer.
 template <typename UInt, typename Char>
 inline void format_decimal(Char *buffer, UInt value, unsigned num_digits) {