Environment:
Windows Server 2016 + VS2017 Update 5 + Google_protobuf master branch latest srouce code

Google_protobuf failed to run the TextFormatMapTest.DynamicMessage with release configuration and debug configuration. Could you please help take a look at this? Thanks in advance!

What did you do?
Steps to reproduce the behavior:
1.git clone https://github.com/google/protobuf.git D:\Google-Protobuf\src
2.Open a VS 2017 command prompt and browse to D:\Google-Protobuf
3.build_x64_ltcg && pushd build_x64_ltcg
4.cmake -G "Visual Studio 15 2017" -DCMAKE_SYSTEM_VERSION=10.0.16299.0 ..\src\cmake
5.popd
6.msbuild /p:Configuration=Debug;Platform=x64 build_x64\protobuf.sln /t:Rebuild
7.pushd src
8. ..\build_x64_ltcg\Debug\tests.exe --gtest_filter=TextFormatMapTest.DynamicMessage

Actual result:
[ FAILED ] 1 test, listed below:
[ FAILED ] TextFormatMapTest.DynamicMessage
log_x64_ltcg_test_1.log

TestErrorMessage:
[----------] Global test environment tear-down
[==========] 2002 tests from 188 test cases ran. (15077 ms total)
[ PASSED ] 2001 tests.
[ FAILED ] 1 test, listed below:
[ FAILED ] TextFormatMapTest.DynamicMessage
1 FAILED TEST
[command took 15 seconds]