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Sculpt dyntopo: Finished bmesh cache coherency tester

To run, in the python console enter:

bpy.msgbus.pbvh_bmesh_do_cache_test()

The output will be in the regular console. The test
build a half-million vert cube and smooths it. It runs
several passes (all of which perform the same smoothing
operation):

1; Randomized order pass
2. Ordered pass (by vertex clustering)
3. Same as 2 but with a purely data-oriented version
of the bmesh structs.
4. Same as 2, but using a version of the bmesh structs
with all pointers replaced by integer indices.

At least on my laptop #3 and #2 are about a third faster
then #1, and #2 tends to be around 15%.