Dataflow: Refactor getLocation

Author: aschackmull

shared/dataflow/codeql/dataflow/internal/DataFlowImpl.qll

@@ -2541,12 +2541,13 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {
 
             abstract string toString();
 
-            abstract Location getLocation();
-
             predicate isSource() { none() }
 
             predicate isSink() { none() }
 
+            /** Gets the location of this node. */
+            Location getLocation() { result = this.getNodeEx().getLocation() }
+
             predicate isArbitrarySource() { this instanceof TStagePathNodeSrcGrp }
 
             predicate isArbitrarySink() { this instanceof TStagePathNodeSinkGrp }
@@ -2589,8 +2590,6 @@ module MakeImpl<LocationSig Location, InputSig<Location> Lang> {
                 node.toString() + " " + cc.toString() + " " + t.toString() + " " + ap.toString()
             }
 
-            override Location getLocation() { result = node.getLocation() }
-
             override predicate isSource() {
               sourceNode(node, state) and
               (if hasSourceCallCtx() then cc = ccSomeCall() else cc = ccNone()) and