runtime: stack split at bad time in os/signal with Go 1.25.4 windows 386 [1.24 backport]

[gopherbot]

@randall77 requested issue #76702 to be considered for backport to the next 1.24 minor release.

@gopherbot please open backport issues.

[gopherbot]

Change https://go.dev/cl/728580 mentions this issue: [release-branch.go1.24] runtime: mark getfp as nosplit