Reject runtime async Await in ordinary task state machines - #20584
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Reset runtime-async and inline emission context at generated method boundaries, preserving the enclosing runtime-async body. Cover FS3918 diagnostics, imported inline templates, staged legal composition, and emitted method flags in both optimization modes. Fixes #20576 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Fixes #20576
Report FS3918 for runtime-only
Awaitcalls inside ordinary task state-machine methods, while preserving normal task composition inside runtime-async methods.