[Concurrency] SwiftStdlib 5.5 ⟹ SwiftStdlib 5.1 (definitions)

The concurrency runtime now deploys back to macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, which corresponds to the 5.1 release of the stdlib.

Adjust the definition of the SwiftStdlib availability macro accordingly.

Author: lorentey

stdlib/private/StdlibUnittest/CMakeLists.txt

@@ -56,7 +56,7 @@ add_swift_target_library(swiftStdlibUnittest ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES}
   SWIFT_MODULE_DEPENDS_WINDOWS CRT WinSDK
   SWIFT_COMPILE_FLAGS ${swift_stdlib_unittest_compile_flags} ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
     -Xfrontend -define-availability
-    -Xfrontend "SwiftStdlib 5.5:macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0"
+    -Xfrontend "SwiftStdlib 5.1:macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0"
   INSTALL_IN_COMPONENT stdlib-experimental
   DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}"
   LINK_LIBRARIES ${swift_stdlib_unittest_link_libraries})

stdlib/public/Concurrency/CMakeLists.txt

@@ -128,7 +128,7 @@ add_swift_target_library(swift_Concurrency ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} I
     -parse-stdlib
     -Xfrontend -enable-experimental-concurrency
     -Xfrontend -define-availability
-    -Xfrontend "SwiftStdlib 5.5:macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0"
+    -Xfrontend "SwiftStdlib 5.1:macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0"
     ${SWIFT_RUNTIME_CONCURRENCY_SWIFT_FLAGS}
   ${swift_concurrency_options}
   INSTALL_IN_COMPONENT ${swift_concurrency_install_component}

test/lit.cfg

@@ -432,7 +432,7 @@ lit_config.note('Compiling with -swift-version ' + swift_version)
 config.swift_test_options = '-swift-version ' + swift_version
 
 # Define a macro for the next release OS version.
-swift_stdlib_macro = '\'SwiftStdlib 5.5:macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0\''
+swift_stdlib_macro = '\'SwiftStdlib 5.1:macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0\''
 config.swift_frontend_test_options += ' -define-availability ' + swift_stdlib_macro
 config.swift_driver_test_options += ' -Xfrontend -define-availability -Xfrontend ' + swift_stdlib_macro