Export of internal Abseil changes

--
016342692a38a2ecb7e2e3bb658ad0e352cd5885 by Gennadiy Rozental <rogeeff@google.com>:

Minor documentation fix for base/attributes.h

Import of https://github.com/abseil/abseil-cpp/pull/673

PiperOrigin-RevId: 308703106

--
cf0abc14f9a8fb9ccf99a8ac7475d2100771ed89 by Greg Falcon <gfalcon@google.com>:

internal change

PiperOrigin-RevId: 308684014

--
ea6ffabf61d09cfc9b791c1144a155c6be45f086 by Gennadiy Rozental <rogeeff@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 308672487

--
2106b40ade57dd07039705a9f1198b06f535a8de by Abseil Team <absl-team@google.com>:

Replace deprecated thread annotations macro

PiperOrigin-RevId: 308604266
GitOrigin-RevId: 016342692a38a2ecb7e2e3bb658ad0e352cd5885
Change-Id: Ib9dd67ffd3a9807d55cad53472348e797b43cd24

absl/base/internal/sysinfo.cc

@@ -53,6 +53,7 @@
 #include "absl/base/internal/raw_logging.h"
 #include "absl/base/internal/spinlock.h"
 #include "absl/base/internal/unscaledcycleclock.h"
+#include "absl/base/thread_annotations.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
@@ -351,7 +352,7 @@ static absl::base_internal::SpinLock tid_lock(
 // We set a bit per thread in this array to indicate that an ID is in
 // use. ID 0 is unused because it is the default value returned by
 // pthread_getspecific().
-static std::vector<uint32_t>* tid_array GUARDED_BY(tid_lock) = nullptr;
+static std::vector<uint32_t>* tid_array ABSL_GUARDED_BY(tid_lock) = nullptr;
 static constexpr int kBitsPerWord = 32;  // tid_array is uint32_t.
 
 // Returns the TID to tid_array.

absl/strings/cord.cc

@@ -15,6 +15,7 @@
 #include "absl/strings/cord.h"
 
 #include <algorithm>
+#include <atomic>
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>

absl/time/internal/cctz/testdata/version

-2019c
+2020a

absl/time/internal/cctz/testdata/zoneinfo/zone1970.tab

@@ -128,8 +128,8 @@ CA	+4906-11631	America/Creston	MST - BC (Creston)
 CA	+5946-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
 CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
 CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
-CA	+6043-13503	America/Whitehorse	Pacific - Yukon (south)
-CA	+6404-13925	America/Dawson	Pacific - Yukon (north)
+CA	+6043-13503	America/Whitehorse	Pacific - Yukon (east)
+CA	+6404-13925	America/Dawson	Pacific - Yukon (west)
 CC	-1210+09655	Indian/Cocos
 CH,DE,LI	+4723+00832	Europe/Zurich	Swiss time
 CI,BF,GM,GN,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
@@ -173,7 +173,7 @@ GE	+4143+04449	Asia/Tbilisi
 GF	+0456-05220	America/Cayenne
 GH	+0533-00013	Africa/Accra
 GI	+3608-00521	Europe/Gibraltar
-GL	+6411-05144	America/Godthab	Greenland (most areas)
+GL	+6411-05144	America/Nuuk	Greenland (most areas)
 GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
 GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
 GL	+7634-06847	America/Thule	Thule/Pituffik
@@ -290,7 +290,7 @@ RS,BA,HR,ME,MK,SI	+4450+02030	Europe/Belgrade
 RU	+5443+02030	Europe/Kaliningrad	MSK-01 - Kaliningrad
 RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
 # Mention RU and UA alphabetically.  See "territorial claims" above.
-RU,UA	+4457+03406	Europe/Simferopol	MSK+00 - Crimea
+RU,UA	+4457+03406	Europe/Simferopol	Crimea
 RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
 RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
 RU	+4844+04425	Europe/Volgograd	MSK+01 - Volgograd
@@ -341,8 +341,8 @@ TT,AG,AI,BL,DM,GD,GP,KN,LC,MF,MS,VC,VG,VI	+1039-06131	America/Port_of_Spain
 TV	-0831+17913	Pacific/Funafuti
 TW	+2503+12130	Asia/Taipei
 UA	+5026+03031	Europe/Kiev	Ukraine (most areas)
-UA	+4837+02218	Europe/Uzhgorod	Ruthenia
-UA	+4750+03510	Europe/Zaporozhye	Zaporozh'ye/Zaporizhia; Lugansk/Luhansk (east)
+UA	+4837+02218	Europe/Uzhgorod	Transcarpathia
+UA	+4750+03510	Europe/Zaporozhye	Zaporozhye and east Lugansk
 UM	+1917+16637	Pacific/Wake	Wake Island
 US	+404251-0740023	America/New_York	Eastern (most areas)
 US	+421953-0830245	America/Detroit	Eastern - MI (most areas)