DynamoRIO / DynamoRIO/dynamorio

ASSERT in spinmutex_trylock: mutexval == LOCK_FREE_STATE running drcachesim

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Bug-Assert Component-DrMemtrace
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Description

The closest existing filed bug is #1166 but that's a different lock type.

I hit this running:

```
$ rm -rf drmemtrace.threadsig.*.dir; bin64/drrun -t drcachesim -offline -- ~/dr/test/threadsig 20 100000

<...>
<(1+x) Handling our fault in a TRY at 0x00007fe30c0a6191>

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