* module/language/cps/devirtualize-integers.scm (peel-trace): Update
comment.
* module/language/cps/contification.scm (apply-contification): Update to
never contify a return of $primcall to $kreceive.
* module/language/cps/verify.scm (check-arities): Require that primcalls
continue to $kargs.
* module/language/cps.scm ($branch): Refactor to be its own CPS term
type, not relying on $continue to specify a continuation (which before
was only for the false case) or a source location. Update allllllll
callers.
* module/language/cps/compile-bytecode.scm (compile-function): Remove
helper to look up constants now that primcalls can take parameters.
* module/language/cps/devirtualize-integers.scm (peel-trace): Remove
extra argument to expression-effects.
* module/language/cps/effects-analysis.scm (constant?, indexed-field):
Remove unused definitions.
(expression-effects): Remove "constants" argument; constants come from
primcall params.
(compute-effects): Don't compute a constants table.
* module/language/cps/slot-allocation.scm ($allocation): Remove
"constant-values" field.
(lookup-constant-value, lookup-maybe-constant-value): Remove; unused.
(allocate-slots): Don't create a constants table.
* module/language/cps/specialize-primcalls.scm
(compute-defining-expressions, compute-constant-values): Move these
definitions here, which were previously in utils.scm
* module/language/cps/utils.scm: Remove moved definitions.
