* john/tools/fix-cover-register-race/ERL-943/OTP-15813:
  cover: Fix register/2 race on startup

* dgud/emacs-test-uc-path:
  Fix emacs tests

* lukas/tools/overhead_benchmark:
  etp: Fix free de processes check
  tools: Add overhead benchmark

Didn't work if installed path contained spaces or unicode characters.

Fetch and present arity in the *xref* window (unless too many hits).

If we are reasonably sure which definition the user wants to go to
then jump there directly instead of popping to the *xref* window.

Use `counters:add/3` instead of `ets:update_counter/3`
for counting the number of times a line is executed.

By default, the reference to the counter array for each module will be
stored in a persistent term and retrieved every time a counter is
updated. This makes the compiler test suite with coverage enabled run
*almost* twice as fast (on my computer, in about 6 minutes down from
more than 11 minutes).

To get even more speed, the new `cover:local_only/0` function can be
called to put cover into a mode where the cover-compiled code can only
be run on the local node. In this mode, the cover-compiled modules in
a more efficient way by compiling the counter reference into the
code. This shaves off about one more minute, making the compiler test
suite with coverage enabled run *more than* twice as fast (in about 5
minutes on my computer).

* maint:
  Run emacs tests from test_suite
  Emacs: consider case in erlang-get-identifier-at-point
  Emacs: do not accept compiler warnings in selected elisp files
  Emacs: add test-erlang-mode