eliminate dead code.

Author: aschackmull

shared/controlflow/codeql/controlflow/AstConsistency.qll

@@ -10,8 +10,6 @@ private import ControlFlowGraph
 module MakeAstConsistency<LocationSig Location, AstSig<Location> Ast> {
   private import Ast
 
-  private AstNode getParent(AstNode child) { child = getChild(result, _) }
-
   private predicate astMemberChild(AstNode parent, AstNode child, string member) {
     callableGetBody(parent) = child and member = "Callable.getBody"
     or