runtimes/google/ipc: fix flaky test, hopefully and bug in verror2 stack reporting.
runtimes/google/ipc: fix flaky test, hopefully and bug in verror2 stack reporting.

Change-Id: I75b227805d8584e14847e274f419ec5af8f93a33

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23