Java/C#: Adapt to signature change.

csharp/ql/lib/semmle/code/csharp/controlflow/internal/ControlFlowGraph.qll

@@ -145,6 +145,8 @@ module Ast implements AstSig<Location> {
   final private class ParameterFinal = CS::Parameter;
 
   class Parameter extends ParameterFinal {
+    AstNode getPattern() { result = this }
+
     Expr getDefaultValue() {
       // Avoid combinatorial explosions for callables with multiple bodies
       result = unique( | | super.getDefaultValue())

java/ql/lib/semmle/code/java/ControlFlowGraph.qll

@@ -61,6 +61,8 @@ private module Ast implements AstSig<Location> {
   class Parameter extends AstNode {
     Parameter() { none() }
 
+    AstNode getPattern() { none() }
+
     Expr getDefaultValue() { none() }
   }