DynamoRIO / DynamoRIO/dynamorio

Thread is missing exit invariant failure on drcachesim.invariants test

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Component-DrMemtrace Component-Tests
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C
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Description

The x86_64 tool.drcachesim.invariants has failed on the master merge a
number of times in the tool.drcachesim.invariants test:

Some older ones:
https://github.com/DynamoRIO/dynamorio/actions/runs/7731301531/job/21078628227
https://github.com/DynamoRIO/dynamorio/actions/runs/7732983950/job/21084129568

A few more recent ones too.
https://github.com/DynamoRIO/dynamorio/actions/runs/8442624559/job/23124442264

```
Trace invariant failure in T27434 at ref # 373883 (0 instrs since timestamp 13351202897274636): Thread is missing exit
```

Locally I can reproduce:
```
$ ctest --repeat-until-fail 500 -R sim.invariants
```
Failed after 29 successes.

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