Changes imported from Abseil "staging" branch:

- d1a8e5ddbf9f96a4ca020260b21e03820c5ff966 Remove references to the non-existing StringPrintf API to... by Abseil Team <absl-team@google.com>
  - 64a422bc1620b29247a81fab2b08a7f23dfc1461 Add a copy and move constructor to FixedArray.  This does... by Jon Cohen <cohenjon@google.com>

GitOrigin-RevId: d1a8e5ddbf9f96a4ca020260b21e03820c5ff966
Change-Id: I4388bdf1260702f2847307abbac4bf265e8cf90f

absl/container/fixed_array.h

@@ -47,6 +47,7 @@
 #include "absl/base/macros.h"
 #include "absl/base/optimization.h"
 #include "absl/base/port.h"
+#include "absl/memory/memory.h"
 
 namespace absl {
 
@@ -107,6 +108,15 @@ class FixedArray {
           ? kInlineBytesDefault / sizeof(value_type)
           : inlined;
 
+  FixedArray(const FixedArray& other) : rep_(other.begin(), other.end()) {}
+  FixedArray(FixedArray&& other) noexcept(
+  // clang-format off
+      absl::allocator_is_nothrow<std::allocator<value_type>>::value &&
+  // clang-format on
+          std::is_nothrow_move_constructible<value_type>::value)
+      : rep_(std::make_move_iterator(other.begin()),
+             std::make_move_iterator(other.end())) {}
+
   // Creates an array object that can store `n` elements.
   // Note that trivially constructible elements will be uninitialized.
   explicit FixedArray(size_type n) : rep_(n) {}
@@ -126,11 +136,9 @@ class FixedArray {
 
   ~FixedArray() {}
 
-  // Copy and move construction and assignment are deleted because (1) you can't
-  // copy or move an array, (2) assignment breaks the invariant that the size of
-  // a `FixedArray` never changes, and (3) there's no clear answer as to what
-  // should happen to a moved-from `FixedArray`.
-  FixedArray(const FixedArray&) = delete;
+  // Assignments are deleted because they break the invariant that the size of a
+  // `FixedArray` never changes.
+  void operator=(FixedArray&&) = delete;
   void operator=(const FixedArray&) = delete;
 
   // FixedArray::size()