C#/Java: Materialize sink/source/summary predicates to avoid join on input/output before filtering.

java/ql/src/Telemetry/ExternalApi.qll

@@ -74,16 +74,19 @@ class ExternalApi extends Callable {
   }
 
   /** Holds if this API has a supported summary. */
+  pragma[nomagic]
   predicate hasSummary() {
     this = any(SummarizedCallable sc).asCallable() or
     TaintTracking::localAdditionalTaintStep(this.getAnInput(), _)
   }
 
+  pragma[nomagic]
   predicate isSource() {
     this.getAnOutput() instanceof RemoteFlowSource or sourceNode(this.getAnOutput(), _)
   }
 
   /** Holds if this API is a known sink. */
+  pragma[nomagic]
   predicate isSink() { sinkNode(this.getAnInput(), _) }
 
   /** Holds if this API is supported by existing CodeQL libraries, that is, it is either a recognized source or sink or has a flow summary. */