Swift: add human readable string representation for Location and UnkownAstNode

Author: AlexDenisov

swift/ql/lib/codeql/swift/elements/Location.qll

@@ -1,4 +1,11 @@
-// generated by codegen/codegen.py, remove this comment if you wish to edit this file
 private import codeql.swift.generated.Location
 
-class Location extends LocationBase { }
+class Location extends LocationBase {
+  predicate hasLocationInfo(string path, int sl, int sc, int el, int ec) {
+    path = getFile().getFullName() and
+    sl = getStartLine() and
+    sc = getStartColumn() and
+    el = getEndLine() and
+    ec = getEndColumn()
+  }
+}

swift/ql/lib/codeql/swift/elements/UnknownAstNode.qll

@@ -1,4 +1,5 @@
-// generated by codegen/codegen.py, remove this comment if you wish to edit this file
 private import codeql.swift.generated.UnknownAstNode
 
-class UnknownAstNode extends UnknownAstNodeBase { }
+class UnknownAstNode extends UnknownAstNodeBase {
+  override string toString() { result = getName() }
+}