Add new "throw" VM ops

* libguile/throw.h (scm_ithrow, scm_throw): Mark as SCM_NORETURN.
* libguile/throw.c (scm_throw, scm_ithrow): Adapt to not return.
* libguile/vm-engine.c (throw, throw/value, throw/value+data): New
  instructions.
* libguile/vm.c (vm_throw, vm_throw_with_value)
  (vm_throw_with_value_and_data): New helpers.
* module/language/cps/compile-bytecode.scm (compile-function): Add cases
  for new instructions.
* module/language/cps/prune-bailouts.scm (prune-bailouts): More simple,
  now that there are no $kreceives in play.
* module/language/cps/reify-primitives.scm (reify-clause): Update
  reification of no-clause functions to use new throw op.
* module/language/tree-il/compile-cps.scm (convert): Convert invocations
  of the variable-arity 'throw primitive from Tree-IL to the new
  fixed-arity CPS instructions.
* module/system/vm/assembler.scm (emit-throw/value*)
  (emit-throw/value+data*, emit-throw): Export new instructions.
* module/system/vm/disassembler.scm (code-annotation): Add annotation.

module/system/vm/disassembler.scm

@@ -260,6 +260,8 @@ address of that offset."
        (when (program? val)
          (push-addr! (program-code val) val))
        (list "~@Y" val)))
+    (((or 'throw/value 'throw/value+data) dst target)
+     (list "~@Y" (reference-scm target)))
     (('builtin-ref dst idx)
      (list "~A" (builtin-index->name idx)))
     (((or 'static-ref 'static-set!) _ target)
@@ -511,6 +513,7 @@ address of that offset."
 (define (instruction-has-fallthrough? code pos)
   (define non-fallthrough-set
     (static-opcode-set halt
+                       throw throw/value throw/value+data
                        tail-call tail-call-label tail-call/shuffle
                        return-values
                        subr-call foreign-call continuation-call