Merge pull request #17658 from hvitved/shared/cfg-conditional-splitting

Shared `ConditionalCompletionSplitting` implementation

shared/util/codeql/util/Void.qll

@@ -0,0 +1,10 @@
+/** Provides the empty `Void` class. */
+
+/** The empty void type. */
+private newtype TVoid = TMkVoid() { none() }
+
+/** The trivial empty type. */
+final class Void extends TVoid {
+  /** Gets a textual representation of this element. */
+  string toString() { result = "dummy" }
+}