Merge pull request #12611 from MathiasVP/buffer-access-should-be-evaluated

C++: Exclude unevaluated accesses in `BufferAccess`

cpp/ql/lib/semmle/code/cpp/security/BufferAccess.qll

@@ -14,6 +14,8 @@ int getPointedSize(Type t) {
  * BufferWrite differ.
  */
 abstract class BufferAccess extends Expr {
+  BufferAccess() { not this.isUnevaluated() }
+
   abstract string getName();
 
   /**