Deprecate and inline absl::index_sequence

PiperOrigin-RevId: 910095727
Change-Id: I9f175172108186e03559409be2eb1a0600b6a225

absl/utility/BUILD.bazel

@@ -41,6 +41,7 @@ cc_library(
     linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
         "//absl/base:config",
+        "//absl/base:core_headers",
         "//absl/meta:type_traits",
     ],
 )

absl/utility/CMakeLists.txt

@@ -23,6 +23,7 @@ absl_cc_library(
     ${ABSL_DEFAULT_COPTS}
   DEPS
     absl::config
+    absl::core_headers
     absl::type_traits
   PUBLIC
 )

absl/utility/utility.h

@@ -21,6 +21,7 @@
 #include <utility>
 
 #include "absl/base/config.h"
+#include "absl/base/macros.h"
 
 // TODO(b/290784225): Include what you use cleanup required.
 #include "absl/meta/type_traits.h"
@@ -43,7 +44,11 @@ using std::in_place_type;
 using std::in_place_type_t;
 using std::index_sequence;
 using std::index_sequence_for;
-using std::integer_sequence;
+
+template <class T, T... I>
+using integer_sequence ABSL_DEPRECATE_AND_INLINE() =
+    std::integer_sequence<T, I...>;
+
 using std::make_from_tuple;
 using std::make_index_sequence;
 using std::make_integer_sequence;