runtime: fix stack split at bad time when disable inlining
key32 is called between entersyscallblock and exitsyscall stack split may occur if disable inlining and the G is preempted Fix the problem by describing key32 as nosplit function Fixes #20510 Change-Id: I1f0787995936f34ef0052cf79fde036f1b338865 Reviewed-on: https://go-review.googlesource.com/44390Reviewed-by:Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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