C#: Update data flow and taint-tracking private.

Author: michaelnebel

csharp/ql/lib/semmle/code/csharp/dataflow/internal/DataFlowPrivate.qll

@@ -512,7 +512,7 @@ module LocalFlow {
   predicate localExprStep(Expr e1, Expr e2) {
     e1 = e2.(ParenthesizedExpr).getExpr()
     or
-    e1 = e2.(NullCoalescingExpr).getAnOperand()
+    e1 = e2.(NullCoalescingOperation).getAnOperand()
     or
     e1 = e2.(SuppressNullableWarningExpr).getExpr()
     or
@@ -623,7 +623,7 @@ module LocalFlow {
     (
       e instanceof ConditionalExpr or
       e instanceof Cast or
-      e instanceof NullCoalescingExpr or
+      e instanceof NullCoalescingOperation or
       e instanceof SwitchExpr or
       e instanceof SuppressNullableWarningExpr or
       e instanceof AssignExpr

csharp/ql/lib/semmle/code/csharp/dataflow/internal/TaintTrackingPrivate.qll

@@ -47,9 +47,7 @@ predicate defaultImplicitTaintRead(DataFlow::Node node, DataFlow::ContentSet c)
 private predicate localTaintExprStep(Expr e1, Expr e2) {
   e1 = e2.(ElementAccess).getQualifier()
   or
-  e1 = e2.(AddExpr).getAnOperand()
-  or
-  e1 = e2.(AssignAddExpr).getAnOperand()
+  e1 = e2.(AddOperation).getAnOperand()
   or
   // A comparison expression where taint can flow from one of the
   // operands if the other operand is a constant value.