Fix query compilation errors

Author: nicolaswill

java/ql/lib/experimental/quantum/Language.qll

@@ -117,7 +117,7 @@ abstract class RandomnessInstance extends Crypto::RandomNumberGenerationInstance
   override DataFlow::Node getOutputNode() { result.asExpr() = this }
 }
 
-private class SecureRandomnessInstance extends RandomnessInstance {
+class SecureRandomnessInstance extends RandomnessInstance {
   RandomDataSource source;
 
   SecureRandomnessInstance() {
@@ -128,7 +128,7 @@ private class SecureRandomnessInstance extends RandomnessInstance {
   override string getGeneratorName() { result = source.getSourceOfRandomness().getQualifiedName() }
 }
 
-private class InsecureRandomnessInstance extends RandomnessInstance {
+class InsecureRandomnessInstance extends RandomnessInstance {
   RandomDataSource source;
 
   InsecureRandomnessInstance() {

java/ql/src/experimental/quantum/InventorySlices/KnownAsymmetricAlgorithm.ql

@@ -11,4 +11,4 @@ import java
 import experimental.quantum.Language
 
 from Crypto::AsymmetricAlgorithmNode a
-select a, a.getAlgorithmName()
+select a, a.asAlgorithmNode().getAlgorithmName()

java/ql/src/experimental/quantum/InventorySlices/KnownAsymmetricOperationAlgorithm.ql

@@ -12,4 +12,4 @@ import experimental.quantum.Language
 
 from Crypto::OperationNode op, Crypto::AsymmetricAlgorithmNode a
 where a = op.getAKnownAlgorithm()
-select op, a.getAlgorithmName()
+select op, a.asAlgorithmNode().getAlgorithmName()

shared/quantum/codeql/quantum/experimental/Model.qll

@@ -1584,7 +1584,9 @@ module CryptographyBase<LocationSig Location, InputSig<Location> Input> {
       this.(KeyOperationAlgorithmNode).isAsymmetric()
     }
 
-    string toString() { result = super.getAlgorithmName() }
+    string toString() { result = super.toString() }
+
+    AlgorithmNode asAlgorithmNode() { result = this }
   }
 
   /**