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

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

Change-Id: Ie7d6764b64055caaeb8dc7b6b9d066291e6b538f

third_party/abseil_cpp/absl/flags/parse.cc

@@ -611,6 +611,11 @@ std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
                                         OnUndefinedFlag on_undef_flag) {
   ABSL_INTERNAL_CHECK(argc > 0, "Missing argv[0]");
 
+  // Once parsing has started we will not have more flag registrations.
+  // If we did, they would be missing during parsing, which is a problem on
+  // itself.
+  flags_internal::FinalizeRegistry();
+
   // This routine does not return anything since we abort on failure.
   CheckDefaultValuesParsingRoundtrip();
 
@@ -708,6 +713,11 @@ std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
     std::tie(flag, is_negative) = LocateFlag(flag_name);
 
     if (flag == nullptr) {
+      // Usage flags are not modeled as Abseil flags. Locate them separately.
+      if (flags_internal::DeduceUsageFlags(flag_name, value)) {
+        continue;
+      }
+
       if (on_undef_flag != OnUndefinedFlag::kIgnoreUndefined) {
         undefined_flag_names.emplace_back(arg_from_argv,
                                           std::string(flag_name));
@@ -729,12 +739,13 @@ std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
     }
 
     // 100. Set the located flag to a new new value, unless it is retired.
-    // Setting retired flag fails, but we ignoring it here.
-    if (flag->IsRetired()) continue;
-
+    // Setting retired flag fails, but we ignoring it here while also reporting
+    // access to retired flag.
     std::string error;
     if (!flags_internal::PrivateHandleAccessor::ParseFrom(
             *flag, value, SET_FLAGS_VALUE, kCommandLine, error)) {
+      if (flag->IsRetired()) continue;
+
       flags_internal::ReportUsageError(error, true);
       success = false;
     } else {