merge(3p/absl): subtree merge of Abseil up to e19260f r/1889

... notably, this includes Abseil's own StatusOr type, which
conflicted with our implementation (that was taken from TensorFlow).

Change-Id: Ie7d6764b64055caaeb8dc7b6b9d066291e6b538f

1 files changed, 3 insertions, 2 deletions

diff --git a/third_party/abseil_cpp/absl/container/flat_hash_set.h b/third_party/abseil_cpp/absl/container/flat_hash_set.h
index 94be6e3d13f1..6b89da65714c 100644
--- a/third_party/abseil_cpp/absl/container/flat_hash_set.h
+++ b/third_party/abseil_cpp/absl/container/flat_hash_set.h
@@ -227,7 +227,8 @@ class flat_hash_set
   //
   // size_type erase(const key_type& key):
   //
-  //   Erases the element with the matching key, if it exists.
+  //   Erases the element with the matching key, if it exists, returning the
+  //   number of elements erased (0 or 1).
   using Base::erase;
 
   // flat_hash_set::insert()
@@ -323,7 +324,7 @@ class flat_hash_set
 
   // flat_hash_set::merge()
   //
-  // Extracts elements from a given `source` flat hash map into this
+  // Extracts elements from a given `source` flat hash set into this
   // `flat_hash_set`. If the destination `flat_hash_set` already contains an
   // element with an equivalent key, that element is not extracted.
   using Base::merge;