Compile QAST::WVal.

Note that there's no SC support yet so it doesn't actually work when
run. However, since compiling attribute access depends on it, it was
obscuring the many other things that need work in nqp-mo.pm.

lib/QAST/JASTCompiler.nqp

@@ -2267,6 +2267,20 @@ class QAST::CompilerJAST {
         result($il, $RT_OBJ)
     }
 
+     multi method as_jast(QAST::WVal $node, :$want) {
+        my $val    := $node.value;
+        my $sc     := nqp::getobjsc($val);
+        my $handle := nqp::scgethandle($sc);
+        my $idx    := nqp::scgetobjidx($sc, $val);
+        my $il     := JAST::InstructionList.new();
+        $il.append(JAST::PushSVal.new( :value($handle) ));
+        $il.append(JAST::PushIVal.new( :value($idx) ));
+        $il.append(JAST::Instruction.new( :op('aload_1') ));
+        $il.append(JAST::Instruction.new( :op('invokestatic'), $TYPE_OPS, 'wval',
+            $TYPE_SMO, $TYPE_STR, 'Long', $TYPE_TC ));
+        result($il, $RT_OBJ);
+    }
+
     method coerce($res, $desired) {
         my $got := $res.type;
         if $got == $desired {