Export of internal Abseil changes

--
b770d03c2f1042d399c3f9576e881691cbe962c4 by Abseil Team <absl-team@google.com>:

Avoid applying the workaround for MSVC's static initialization problems when using clang-cl.

PiperOrigin-RevId: 275870089

--
2b8fc02ec49aeb5ad56cef20259cdd7f6ee0c917 by Abseil Team <absl-team@google.com>:

Document return values.

PiperOrigin-RevId: 275839042

--
baa99064f9a28b188661df7fba989fcd558818af by Abseil Team <absl-team@google.com>:

Support "auto" and other uncommon builtin types in absl::debugging_internal::Demangle.

PiperOrigin-RevId: 275556195

--
f9d5c6a3a0d374dbf105d6e2e9e0c8fa949ed187 by Gennadiy Rozental <rogeeff@google.com>:

Internal rework.

PiperOrigin-RevId: 275550005

--
2679a77db5b26349e8c8b2059621af55d2fca139 by Mark Barolak <mbar@google.com>:

Remove a comment reference to the no longer extant ::string implementation.

PiperOrigin-RevId: 275531987

--
7b427a7613c44a98c6f13da43b2bff2837ca6b19 by Derek Mauro <dmauro@google.com>:

Upgrade to Bazel 1.0.0 and CMake 3.15.4

PiperOrigin-RevId: 275500823

--
81f7d20905debf9d1e300bd2e9899f88d27f632a by Derek Mauro <dmauro@google.com>:

Fix -Wimplicit-int-float-conversion warning in latest clang

PiperOrigin-RevId: 275492439
GitOrigin-RevId: b770d03c2f1042d399c3f9576e881691cbe962c4
Change-Id: I9b39dad524489f0d62c912d02e8ac43761c81e55

ci/cmake_install_test.sh

@@ -28,6 +28,5 @@ time docker run \
     --rm \
     -e CFLAGS="-Werror" \
     -e CXXFLAGS="-Werror" \
-    gcr.io/google.com/absl-177019/linux_gcc-latest:20190703 \
+    gcr.io/google.com/absl-177019/linux_gcc-latest:20191018 \
     /bin/bash CMake/install_test_project/test.sh $@
-

ci/linux_clang-latest_libcxx_asan_bazel.sh

@@ -36,7 +36,7 @@ if [ -z ${EXCEPTIONS_MODE:-} ]; then
   EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
 fi
 
-readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20190813"
+readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20191018"
 
 # USE_BAZEL_CACHE=1 only works on Kokoro.
 # Without access to the credentials this won't work.

ci/linux_clang-latest_libcxx_bazel.sh

@@ -36,7 +36,7 @@ if [ -z ${EXCEPTIONS_MODE:-} ]; then
   EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
 fi
 
-readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20190813"
+readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20191018"
 
 # USE_BAZEL_CACHE=1 only works on Kokoro.
 # Without access to the credentials this won't work.

ci/linux_clang-latest_libcxx_tsan_bazel.sh

@@ -36,7 +36,7 @@ if [ -z ${EXCEPTIONS_MODE:-} ]; then
   EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
 fi
 
-readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20190813"
+readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20191018"
 
 # USE_BAZEL_CACHE=1 only works on Kokoro.
 # Without access to the credentials this won't work.

ci/linux_clang-latest_libstdcxx_bazel.sh

@@ -36,7 +36,7 @@ if [ -z ${EXCEPTIONS_MODE:-} ]; then
   EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
 fi
 
-readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20190813"
+readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_clang-latest:20191018"
 
 # USE_BAZEL_CACHE=1 only works on Kokoro.
 # Without access to the credentials this won't work.

ci/linux_gcc-4.9_libstdcxx_bazel.sh

@@ -36,7 +36,7 @@ if [ -z ${EXCEPTIONS_MODE:-} ]; then
   EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
 fi
 
-readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-4.9:20190702"
+readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-4.9:20191018"
 
 # USE_BAZEL_CACHE=1 only works on Kokoro.
 # Without access to the credentials this won't work.

ci/linux_gcc-latest_libstdcxx_bazel.sh

@@ -36,7 +36,7 @@ if [ -z ${EXCEPTIONS_MODE:-} ]; then
   EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
 fi
 
-readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-latest:20190703"
+readonly DOCKER_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-latest:20191018"
 
 # USE_BAZEL_CACHE=1 only works on Kokoro.
 # Without access to the credentials this won't work.

ci/linux_gcc-latest_libstdcxx_cmake.sh

@@ -47,7 +47,7 @@ for std in ${ABSL_CMAKE_CXX_STANDARDS}; do
       --rm \
       -e CFLAGS="-Werror" \
       -e CXXFLAGS="-Werror" \
-      gcr.io/google.com/absl-177019/linux_gcc-latest:20190703 \
+      gcr.io/google.com/absl-177019/linux_gcc-latest:20191018 \
       /bin/bash -c "
         cd /buildfs && \
         cmake /abseil-cpp \