Optimizer support for logtest and logbit?

Optimizer support for logtest and logbit?

* module/language/cps/effects-analysis.scm: Add entries for logtest and
  logbit?.
* module/language/cps/types.scm (logtest, logbit?): New checkers and
  inferrers.
* module/language/tree-il/peval.scm (peval): Convert (zero? (logand a
  b)) to (logtest a b), in anticipation of opcode support for logtest.
*
  module/language/tree-il/primitives.scm (*interesting-primitive-names*):
  (*effect-free-primitives*): Add logtest and logbit?.