Deleting unused predicate.

Author: bdrodes

cpp/ql/lib/semmle/code/cpp/ir/implementation/EdgeKind.qll

@@ -154,14 +154,6 @@ module EdgeKind {
    */
   SehExceptionEdge sehExceptionEdge() { result = TSehExceptionEdge() }
 
-  /**
-   * Gets an instance of the `ExceptionEdge` class.
-   */
-  ExceptionEdge exceptionEdge() {
-    result = cppExceptionEdge() or
-    result = sehExceptionEdge()
-  }
-
   /**
    * Gets the single instance of the `DefaultEdge` class.
    */