ASSERT "unknown whereAmI 6" core/unix/pcprofile.c:563

This has happened twice in the master-merge tests:

https://github.com/DynamoRIO/dynamorio/issues/1807#issuecomment-999296015 prof_pcs|common.decode

ERROR: unknown whereAmI 6
<Application /home/runner/work/dynamorio/dynamorio/build_debug-internal-64/suite/tests/bin/common.decode (41356). Internal Error: DynamoRIO debug check failure: /home/runner/work/dynamorio/dynamorio/core/unix/pcprofile.c:563 false

https://github.com/DynamoRIO/dynamorio/runs/4602849193

Happened again: https://github.com/DynamoRIO/dynamorio/runs/4986838918

I believe this should be easy to fix.