promote last, next and redo to full multi subs

at some point it had to be changed into this, but
it seems like it's safe to have it like this now.

the no-arguments version of those will now not only not
allocate a BOOTArray and a Parcel, but also get jitted
properly due to not using param_sp (slurpy positional)
op codes.

src/core/control.pm

@@ -82,38 +82,53 @@ multi sub take(|) {
 }
 #?endif
 
-my &last := -> | {
+proto sub last(|) { * }
+multi sub last() {
+    THROW(Nil, nqp::const::CONTROL_LAST);
+}
+multi sub last(*@) {
     my Mu $args := nqp::p6argvmarray();
+
     if nqp::islist($args) && nqp::istype(nqp::atpos($args, 0), Label) {
         nqp::atpos($args, 0).last()
     }
     else {
         my $parcel := nqp::decont(&RETURN-PARCEL(nqp::p6parcel($args, Nil)));
         THROW($parcel, nqp::const::CONTROL_LAST)
     }
-};
+}
 
-my &next := -> | {
+proto sub next(|) { * }
+multi sub next() {
+    THROW(Nil, nqp::const::CONTROL_NEXT);
+}
+multi sub next(*@) {
     my Mu $args := nqp::p6argvmarray();
+
     if nqp::islist($args) && nqp::istype(nqp::atpos($args, 0), Label) {
         nqp::atpos($args, 0).next()
     }
     else {
         my $parcel := nqp::decont(&RETURN-PARCEL(nqp::p6parcel($args, Nil)));
         THROW($parcel, nqp::const::CONTROL_NEXT)
     }
-};
+}
 
-my &redo := -> | {
+proto sub redo(|) { * }
+multi sub redo() {
+    THROW(Nil, nqp::const::CONTROL_REDO);
+}
+multi sub redo(*@) {
     my Mu $args := nqp::p6argvmarray();
+
     if nqp::islist($args) && nqp::istype(nqp::atpos($args, 0), Label) {
         nqp::atpos($args, 0).redo()
     }
     else {
         my $parcel := nqp::decont(&RETURN-PARCEL(nqp::p6parcel($args, Nil)));
         THROW($parcel, nqp::const::CONTROL_REDO)
     }
-};
+}
 
 proto sub succeed(|) { * }
 multi sub succeed() {