Export of internal Abseil changes

--
2aa219620f39aa490fa989f5d92e1bd3e52a46c5 by Abseil Team <absl-team@google.com>:

Add lifetime annotations to FunctionRef.

PiperOrigin-RevId: 392131866
GitOrigin-RevId: 2aa219620f39aa490fa989f5d92e1bd3e52a46c5
Change-Id: I295b808986857e46a565e047db25a951dd7ce0e3

absl/functional/BUILD.bazel

@@ -60,6 +60,7 @@ cc_library(
     linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
         "//absl/base:base_internal",
+        "//absl/base:core_headers",
         "//absl/meta:type_traits",
     ],
 )

absl/functional/CMakeLists.txt

@@ -53,6 +53,7 @@ absl_cc_library(
     ${ABSL_DEFAULT_COPTS}
   DEPS
     absl::base_internal
+    absl::core_headers
     absl::meta
   PUBLIC
 )

absl/functional/function_ref.h

@@ -50,6 +50,7 @@
 #include <functional>
 #include <type_traits>
 
+#include "absl/base/attributes.h"
 #include "absl/functional/internal/function_ref.h"
 #include "absl/meta/type_traits.h"
 
@@ -98,7 +99,8 @@ class FunctionRef<R(Args...)> {
  public:
   // Constructs a FunctionRef from any invokable type.
   template <typename F, typename = EnableIfCompatible<const F&>>
-  FunctionRef(const F& f)  // NOLINT(runtime/explicit)
+  // NOLINTNEXTLINE(runtime/explicit)
+  FunctionRef(const F& f ABSL_ATTRIBUTE_LIFETIME_BOUND)
       : invoker_(&absl::functional_internal::InvokeObject<F, R, Args...>) {
     absl::functional_internal::AssertNonNull(f);
     ptr_.obj = &f;