Expand lockorder testing to look at mutexes, not specific instances

Expand lockorder testing to look at mutexes, not specific instances

Our existing lockorder inversion checks look at specific instances
of mutexes rather than the general mutex itself. This changes that
behavior to look at the instruction pointer at which a mutex was
created and treat all mutexes which were created at the same
location as equivalent.

This allows us to detect lockorder inversions which occur across
tests, though it does substantially reduce parallelism during test
runs.