runtime: "traceback did not unwind completely" [1.21 backport]

[gopherbot]

@aclements requested issue #62326 to be considered for backport to the next 1.21 minor release.

@gopherbot , please backport to Go 1.21.

This causes the runtime to crash when an assembly function that modifies SP grows the stack or is preempted for GC. This should be pretty rare, but the crash is difficult to work around.

[cherrymui]

This fixes a runtime fatal error that is a regression. Approved.

[gopherbot]

Change https://go.dev/cl/526100 mentions this issue: [release-branch.go1.21] runtime: ignore SPWrite on innermost traceback frame

[gopherbot]

Closed by merging d7a0626 to release-branch.go1.21.