Switch QAST::Regex attributes to use native types.

src/QAST/Regex.nqp

@@ -1,17 +1,16 @@
 class QAST::Regex is QAST::Node {
-    has $!rxtype;
-    has $!subtype;
-    has $!backtrack;
-    has $!negate;
-    has $!min;
-    has $!max;
+    has str $!rxtype;
+    has str $!subtype;
+    has str $!backtrack;
+    has int $!negate;
+    has int $!min;
+    has int $!max;
 
     method rxtype(*@value)    { $!rxtype := @value[0] if @value; $!rxtype }
     method subtype(*@value)   { $!subtype := @value[0] if @value; $!subtype }
     method backtrack(*@value) { $!backtrack := @value[0] if @value; $!backtrack }
     method negate(*@value)    { $!negate := @value[0] if @value; $!negate }
     method min(*@value)       { $!min := @value[0] if @value; $!min }
     method max(*@value)       { $!max := @value[0] if @value; $!max }
-
 }