Wire up `guild compile -O0 foo.scm'

* module/scripts/compile.scm (%options): Resurrect -O option and make it
  follow GCC, more or less.  The default is equivalent to -O2.

* module/language/cps/compile-bytecode.scm (lower-cps):
* module/language/cps/optimize.scm (optimize-higher-order-cps): Move
  split-rec to run unconditionally for now, as closure conversion fails
  without it.
  (define-optimizer): Only verify the result if we are debugging, to
  save time.
  (cps-default-optimization-options): New exported procedure.

* module/language/tree-il/optimize.scm
  (tree-il-default-optimization-options): New exported procedure.

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