[Swift CI] Build Failure: 0. OSS - Swift Incremental RA - Ubuntu 18.04 - Long Test (master) #4212

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# [FAILURE] oss-swift-incremental-RA-linux-ubuntu-18_04-long-test [#4212]

Build URL: https://ci.swift.org/job/oss-swift-incremental-RA-linux-ubuntu-18_04-long-test/4212/
Project: oss-swift-incremental-RA-linux-ubuntu-18_04-long-test
Date of build: Tue, 25 Aug 2020 11:00:43 -0500
Build duration: 2 hr 31 min

Changes- Commit 9ead8d57faa1e7290139dc71d46086a66fff35b6 by github:

Add a single-threaded stdlib mode, use it for the 'minimal' stdlib (#33437)

  • edit: include/swift/Runtime/Mutex.h

  • edit: include/swift/Runtime/Once.h

  • edit: stdlib/public/stubs/ThreadLocalStorage.cpp

  • edit: utils/build-script-impl

  • edit: include/swift/Basic/Lazy.h

  • add: include/swift/Runtime/MutexSingleThreaded.h

  • edit: stdlib/public/runtime/Once.cpp

  • edit: utils/build-presets.ini

  • edit: stdlib/public/runtime/MutexPThread.cpp

  • edit: stdlib/CMakeLists.txt

  • edit: CMakeLists.txt

  • edit: stdlib/public/runtime/Exclusivity.cpp

  • edit: stdlib/public/stubs/Stubs.cpp

  • edit: stdlib/cmake/modules/AddSwiftStdlib.cmake

  • delete: include/swift/Runtime/MutexWASI.h

  • edit: stdlib/public/runtime/MetadataCache.h

  • edit: stdlib/public/runtime/CMakeLists.txt

  • Commit 736dc91d7eab865f18dfdfe6fc68bab3de2df2d4 by achikin:

    [Readme] Document flow of testing against tip-of-trunk frontend.

    • edit: README.md