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osyield is called in code paths that are not allowed to split
stack, e.g. casgstatus called from entersyscall/exitsyscall.
It is nosplit on all other platforms. Mark it nosplit on OpenBSD
as well.

Change-Id: I3fed5d7f58b3d50610beca6eed2c7e902b8ec52c
Trust: Cherry Mui <>
Run-TryBot: Cherry Mui <>
TryBot-Result: Go Bot <>
Reviewed-by: Joel Sing <>


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The Go Programming Language

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