Export of internal Abseil changes

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ec39082e792ef7bb17e8432b6e10d1cb96dbad24 by Derek Mauro <dmauro@google.com>:

Fix a sign-compare warning in btree.h

Fixes #771

PiperOrigin-RevId: 328653403
GitOrigin-RevId: ec39082e792ef7bb17e8432b6e10d1cb96dbad24
Change-Id: I6b681dcda4fd8933257b06d0428d40b1d01f6ad1

absl/container/internal/btree.h

@@ -1014,6 +1014,7 @@ class btree {
   using node_type = btree_node<Params>;
   using node_type = btree_node<Params>;
   using is_key_compare_to = typename Params::is_key_compare_to;
   using is_key_compare_to = typename Params::is_key_compare_to;
   using init_type = typename Params::init_type;
   using init_type = typename Params::init_type;
+  using field_type = typename node_type::field_type;
 
 
   // We use a static empty node for the root/leftmost/rightmost of empty btrees
   // We use a static empty node for the root/leftmost/rightmost of empty btrees
   // in order to avoid branching in begin()/end().
   // in order to avoid branching in begin()/end().
@@ -2432,7 +2433,7 @@ inline auto btree<P>::internal_emplace(iterator iter, Args &&... args)
     --iter;
     --iter;
     ++iter.position;
     ++iter.position;
   }
   }
-  const int max_count = iter.node->max_count();
+  const field_type max_count = iter.node->max_count();
   allocator_type *alloc = mutable_allocator();
   allocator_type *alloc = mutable_allocator();
   if (iter.node->count() == max_count) {
   if (iter.node->count() == max_count) {
     // Make room in the leaf for the new item.
     // Make room in the leaf for the new item.