Add logging to internal gvisor when checking for kcov.
Add logging to internal gvisor when checking for kcov.

May help with debugging
https://syzkaller.appspot.com/bug?id=0d717bd7028dceeb4b38f09aab2841c398b41d81

PiperOrigin-RevId: 341640485

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor