src: add enum handle for ToStringHelper + formatting

Fixes: #56666

Author: wooffie

src/debug_utils-inl.h

@@ -38,7 +38,7 @@ struct ToStringHelper {
 
   template <typename T,
             typename test_for_number = typename std::
-                enable_if<std::is_arithmetic<T>::value, bool>::type,
+                enable_if_t<std::is_arithmetic_v<T> || std::is_enum_v<T>, bool>,
             typename dummy = bool>
   static std::string Convert(const T& value) { return std::to_string(value); }
   static std::string_view Convert(const char* value) {
@@ -58,8 +58,7 @@ struct ToStringHelper {
     const char* digits = "0123456789abcdef";
     do {
       unsigned digit = v & ((1 << BASE_BITS) - 1);
-      *--ptr =
-          (BASE_BITS < 4 ? static_cast<char>('0' + digit) : digits[digit]);
+      *--ptr = (BASE_BITS < 4 ? static_cast<char>('0' + digit) : digits[digit]);
     } while ((v >>= BASE_BITS) != 0);
     return ptr;
   }
@@ -139,12 +138,10 @@ std::string COLD_NOINLINE SPrintFImpl(  // NOLINT(runtime/string)
       ret += node::ToUpper(ToBaseString<4>(arg));
       break;
     case 'p': {
-      CHECK(std::is_pointer<typename std::remove_reference<Arg>::type>::value);
+      CHECK(std::is_pointer_v<typename std::remove_reference_t<Arg>>);
       char out[20];
-      int n = snprintf(out,
-                       sizeof(out),
-                       "%p",
-                       *reinterpret_cast<const void* const*>(&arg));
+      int n = snprintf(
+          out, sizeof(out), "%p", *reinterpret_cast<const void* const*>(&arg));
       CHECK_GE(n, 0);
       ret += out;
       break;