Clean up bytecomp-tests.el

Clean up bytecomp-tests.el

Now all test cases are run with both lexical and dynamic binding
where applicable, comparing interpreted against compiled results.
Previously, almost all tests were only run with dynamic binding
which was definitely not intended.

* test/lisp/emacs-lisp/bytecomp-tests.el
(byte-opt-testsuite-arith-data): Rename to bytecomp-tests--test-cases.
(bytecomp-check-1, bytecomp-explain-1, bytecomp-tests)
(bytecomp-lexbind-tests, bytecomp-lexbind-check-1)
(bytecomp-lexbind-explain-1): Remove.
(bytecomp-tests--eval-interpreted, bytecomp-tests--eval-compiled)
(bytecomp-tests-lexbind, bytecomp-tests-dynbind)
(bytecomp-tests--test-cases-lexbind-only): New.