add second_deadlock_stack=1 to TSAN options
#31232
This is mentioned in the developer notes, but isn’t present in TSAN_OPTIONS, resulting in:
0WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock) (pid=60508)
1 Cycle in lock order graph: M0 (0xffff98e02208) => M1 (0xffff98e0cbe8) => M2 (0xffff98e0cd98) => M0
2<snip>
3
4 Hint: use TSAN_OPTIONS=second_deadlock_stack=1 to get more informative warning message
Add it, for (potentially) more informative output, when failures occur. Checked that adding does output more information.
This is mentioned in the developer notes, but isn't present in
`TSAN_OPTIONS`, resulting in:
```bash
WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock) (pid=60508)
Cycle in lock order graph: M0 (0xffff98e02208) => M1 (0xffff98e0cbe8) => M2 (0xffff98e0cd98) => M0
<snip>
Hint: use TSAN_OPTIONS=second_deadlock_stack=1 to get more informative warning message
```
Add it, for (potentially) more informative output, when failures
occur. Checked that adding does output more information.
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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/31232.
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