Remove backfills of some type traits that are now fully supported

PiperOrigin-RevId: 512622121
Change-Id: If90aaf7939062bd475253c372d9d7950c98c7150

absl/base/config.h

@@ -237,15 +237,8 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 // ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
 // ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
 //
 //
 // Checks whether `std::is_trivially_destructible<T>` is supported.
 // Checks whether `std::is_trivially_destructible<T>` is supported.
-//
-// Notes: All supported compilers using libc++ support this feature, as does
-// gcc >= 4.8.1 using libstdc++, and Visual Studio.
 #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
 #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
 #error ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set
 #error ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set
-#elif defined(_LIBCPP_VERSION) || defined(_MSC_VER) || \
-    (defined(__clang__) && __clang_major__ >= 15) ||   \
-    (!defined(__clang__) && defined(__GLIBCXX__) &&    \
-     ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(4, 8))
 #define ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1
 #define ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1
 #endif
 #endif
 
 
@@ -253,36 +246,26 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 //
 //
 // Checks whether `std::is_trivially_default_constructible<T>` and
 // Checks whether `std::is_trivially_default_constructible<T>` and
 // `std::is_trivially_copy_constructible<T>` are supported.
 // `std::is_trivially_copy_constructible<T>` are supported.
+#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+#error ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set
+#else
+#define ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1
+#endif
 
 
 // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
 // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
 //
 //
 // Checks whether `std::is_trivially_copy_assignable<T>` is supported.
 // Checks whether `std::is_trivially_copy_assignable<T>` is supported.
-
-// Notes: Clang with libc++ supports these features, as does gcc >= 7.4 with
-// libstdc++, or gcc >= 8.2 with libc++, and Visual Studio (but not NVCC).
-#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE)
-#error ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set
-#elif defined(ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE)
-#error ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot directly set
-#elif (defined(__clang__) && defined(_LIBCPP_VERSION)) ||                    \
-    (defined(__clang__) && __clang_major__ >= 15) ||                         \
-    (!defined(__clang__) &&                                                  \
-     ((ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(7, 4) && defined(__GLIBCXX__)) || \
-      (ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(8, 2) &&                          \
-       defined(_LIBCPP_VERSION)))) ||                                        \
-    (defined(_MSC_VER) && !defined(__NVCC__) && !defined(__clang__))
-#define ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1
+#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
+#error ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot be directly set
+#else
 #define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1
 #define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1
 #endif
 #endif
 
 
 // ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE
 // ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE
 //
 //
 // Checks whether `std::is_trivially_copyable<T>` is supported.
 // Checks whether `std::is_trivially_copyable<T>` is supported.
-//
-// Notes: Clang 15+ with libc++ supports these features, GCC hasn't been tested.
-#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE)
+#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE
 #error ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE cannot be directly set
 #error ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE cannot be directly set
-#elif defined(__clang__) && (__clang_major__ >= 15)
 #define ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE 1
 #define ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE 1
 #endif
 #endif