perf: update function name to match `perfbranchmapload` command
Having function with the same name as the command is simpler.
context: floor adjustlinkrev graph walk during copy tracing
The `_adjustlinkrev` method gains an optional "stoprev" argument. The linkrev
adjustment will give up once this floor is reached. The relevant functions
using `_adjustlinkrev` are updated to pass an appropriate value in the copy
tracing code.
In some private repository, about 10% of the status call triggered the
pathological case addressed by this change. The speedup varies from one call
to another, the best-observed win is moving from 170s to 11s.
The effect of this change can be seen in the public pypy repository, running the
following command:
hg perftracecopies --source
83c9ff0c0206 --destination
59c79103d5b0
before: 3.401753 seconds
after: 2.634897 seconds (-23%)