Make `c_find_first_of`'s `options` parameter a const reference to allow temporaries.

`c_find_first_of` does not keep or return references into `options` so there's no reason to require an l-value there.

PiperOrigin-RevId: 690696332
Change-Id: Ibbabb69ba72e9506c0406f2124034a944d6899d6

absl/algorithm/container.h

@@ -290,7 +290,7 @@ ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20
 template <typename C1, typename C2>
 ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20
     container_algorithm_internal::ContainerIter<C1>
-    c_find_first_of(C1& container, C2& options) {
+    c_find_first_of(C1& container, const C2& options) {
   return std::find_first_of(container_algorithm_internal::c_begin(container),
                             container_algorithm_internal::c_end(container),
                             container_algorithm_internal::c_begin(options),
@@ -302,7 +302,7 @@ ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20
 template <typename C1, typename C2, typename BinaryPredicate>
 ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20
     container_algorithm_internal::ContainerIter<C1>
-    c_find_first_of(C1& container, C2& options, BinaryPredicate&& pred) {
+    c_find_first_of(C1& container, const C2& options, BinaryPredicate&& pred) {
   return std::find_first_of(container_algorithm_internal::c_begin(container),
                             container_algorithm_internal::c_end(container),
                             container_algorithm_internal::c_begin(options),

absl/algorithm/container_test.cc

@@ -139,11 +139,13 @@ TEST_F(NonMutatingTest, FindEndWithPredicate) {
 TEST_F(NonMutatingTest, FindFirstOf) {
   absl::c_find_first_of(container_, sequence_);
   absl::c_find_first_of(sequence_, container_);
+  absl::c_find_first_of(sequence_, std::array<int, 2>{1, 2});
 }
 
 TEST_F(NonMutatingTest, FindFirstOfWithPredicate) {
   absl::c_find_first_of(container_, sequence_, BinPredicate);
   absl::c_find_first_of(sequence_, container_, BinPredicate);
+  absl::c_find_first_of(sequence_, std::array<int, 2>{1, 2}, BinPredicate);
 }
 
 TEST_F(NonMutatingTest, AdjacentFind) { absl::c_adjacent_find(sequence_); }