StdlibUnittest: import _Concurrency explicitly #39175
Merged
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StdlibUnittest is built with
-disable-implicit-concurrency-module-import
and it uses concurrency feature. Therefore, without explicit import,
StdlibUnittest.swiftmodule doesn't have
IMPORTED_MODULE
entry of_Concurrency
. And it results link-failure when static linking becauseswift_Concurrency is not linked.
Part of SR-9307.
cc @kateinoigakukun