scripted-diff: modernize outdated trait patterns - values

See https://en.cppreference.com/w/cpp/types/is_enum for more details.

-BEGIN VERIFY SCRIPT-
sed -i -E 's/(std::[a-z_]+)(<[^<>]+>)::value\b/\1_v\2/g' $(git grep -l '::value' ./src ':(exclude)src/bench/nanobench.h' ':(exclude)src/minisketch' ':(exclude)src/span.h')
-END VERIFY SCRIPT-

src/test/fuzz/FuzzedDataProvider.h

@@ -203,7 +203,7 @@ template <typename T> T FuzzedDataProvider::ConsumeIntegral() {
 // be less than or equal to |max|.
 template <typename T>
 T FuzzedDataProvider::ConsumeIntegralInRange(T min, T max) {
-  static_assert(std::is_integral<T>::value, "An integral type is required.");
+  static_assert(std::is_integral_v<T>, "An integral type is required.");
   static_assert(sizeof(T) <= sizeof(uint64_t), "Unsupported integral type.");
 
   if (min > max)
@@ -271,7 +271,7 @@ T FuzzedDataProvider::ConsumeFloatingPointInRange(T min, T max) {
 // Returns a floating point number in the range [0.0, 1.0]. If there's no
 // input data left, always returns 0.
 template <typename T> T FuzzedDataProvider::ConsumeProbability() {
-  static_assert(std::is_floating_point<T>::value,
+  static_assert(std::is_floating_point_v<T>,
                 "A floating point type is required.");
 
   // Use different integral types for different floating point types in order
@@ -294,7 +294,7 @@ inline bool FuzzedDataProvider::ConsumeBool() {
 // also contain |kMaxValue| aliased to its largest (inclusive) value. Such as:
 // enum class Foo { SomeValue, OtherValue, kMaxValue = OtherValue };
 template <typename T> T FuzzedDataProvider::ConsumeEnum() {
-  static_assert(std::is_enum<T>::value, "|T| must be an enum type.");
+  static_assert(std::is_enum_v<T>, "|T| must be an enum type.");
   return static_cast<T>(
       ConsumeIntegralInRange<uint32_t>(0, static_cast<uint32_t>(T::kMaxValue)));
 }

src/test/fuzz/integer.cpp

@@ -63,7 +63,7 @@ FUZZ_TARGET(integer, .init = initialize_integer)
     const int16_t i16 = fuzzed_data_provider.ConsumeIntegral<int16_t>();
     const uint8_t u8 = fuzzed_data_provider.ConsumeIntegral<uint8_t>();
     const int8_t i8 = fuzzed_data_provider.ConsumeIntegral<int8_t>();
-    // We cannot assume a specific value of std::is_signed<char>::value:
+    // We cannot assume a specific value of std::is_signed_v<char>:
     // ConsumeIntegral<char>() instead of casting from {u,}int8_t.
     const char ch = fuzzed_data_provider.ConsumeIntegral<char>();
     const bool b = fuzzed_data_provider.ConsumeBool();

src/test/fuzz/util.h

@@ -207,7 +207,7 @@ template <typename WeakEnumType, size_t size>
 template <typename T>
 [[nodiscard]] bool MultiplicationOverflow(const T i, const T j) noexcept
 {
-    static_assert(std::is_integral<T>::value, "Integral required.");
+    static_assert(std::is_integral_v<T>, "Integral required.");
     if (std::numeric_limits<T>::is_signed) {
         if (i > 0) {
             if (j > 0) {