[js] Hacks to allow more code to run with a partial setting which has…

… nqp::null() being passed around.

src/Perl6/Optimizer.nqp

@@ -614,6 +614,9 @@ my class BlockVarOptimizer {
     }
 
     method lexical_vars_to_locals($block) {
+#if js
+        return 0;
+#endif
         return 0 if $!poisoned || $!uses_bindsig;
         return 0 unless nqp::istype($block[0], QAST::Stmts);
         for %!decls {

src/Perl6/World.nqp

@@ -2481,8 +2481,13 @@ class Perl6::World is HLL::World {
     # Adds the result of a constant folding operation to the SC and
     # returns a reference to it.
     method add_constant_folded_result($r) {
-        self.add_object_if_no_sc($r);
-        QAST::WVal.new( :value($r) )
+        if nqp::isnull($r) {
+            QAST::Op.new( :op<null> )
+        }
+        else {
+            self.add_object_if_no_sc($r);
+            QAST::WVal.new( :value($r) )
+        }
     }
 
     # Takes a data structure of non-Perl 6 objects and wraps them up