runtime: gentraceback() dead loop on arm64 casued the process hang [1.17 backport]

[gopherbot]

@cherrymui requested issue #52116 to be considered for backport to the next 1.17 minor release.

@gopherbot please backport this to previous releases. This is a runtime bug which can cause programs to hang or crash. Thanks.

[gopherbot]

Change https://go.dev/cl/408822 mentions this issue: [release-branch.go1.17] runtime: use saved LR when unwinding through morestack

[heschi]

@cherrymui there was some confusion in the release meeting about whether this CL had solved the problem. Is this (and its 1.18 sibling) still a good cherrypick?

[cherrymui]

I think the CL solves the problem. What was the confusion? Thanks.

[heschi]

cc @aclements

[aclements]

We just weren't sure whether this was still a hypothesis or it had been verified to fix the issue. Since it sounds like it's been verified, I think we should approve this cherry-pick.