[wasm] Port thread-related APIs for no thread platform #4870
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This change ports the thread-related APIs for the no thread platform by adding no-op implementations. Note that WASI is going to support threads in the near future, so this does not guard by
TARGET_OS_WASI
but by!SWIFT_CORELIBS_FOUNDATION_HAS_THREADS
to make it easier for future WASI + threads support.