QL: Add more dead-code tests

Author: hvitved

ql/ql/test/queries/style/DeadCode/DeadCode.expected

@@ -1,2 +1,8 @@
-| Foo.qll:2:21:2:25 | ClasslessPredicate dead1 | This code is never used, and it's not publicly exported. |
-| Foo.qll:6:13:6:17 | ClasslessPredicate dead2 | This code is never used, and it's not publicly exported. |
+| Foo.qll:4:21:4:25 | ClasslessPredicate dead1 | This code is never used, and it's not publicly exported. |
+| Foo.qll:8:13:8:17 | ClasslessPredicate dead2 | This code is never used, and it's not publicly exported. |
+| Foo.qll:42:16:42:21 | Module Input1 | This code is never used, and it's not publicly exported. |
+| Foo.qll:46:16:46:21 | Module Input2 | This code is never used, and it's not publicly exported. |
+| Foo.qll:50:16:50:21 | Module Input3 | This code is never used, and it's not publicly exported. |
+| Foo.qll:56:16:56:17 | Module M2 | This code is never used, and it's not publicly exported. |
+| Foo.qll:64:15:64:20 | Class CImpl1 | This code is never used, and it's not publicly exported. |
+| Foo.qll:68:15:68:20 | Class CImpl2 | This code is never used, and it's not publicly exported. |

ql/ql/test/queries/style/DeadCode/Foo.qll

@@ -1,3 +1,5 @@
+import ql
+
 private module Mixed {
   private predicate dead1() { none() }
 
@@ -30,3 +32,37 @@ private module Foo {
 module ValidationMethod<Foo::bar/0 sig> {
   predicate impl() { sig() }
 }
+
+signature module InputSig {
+  predicate foo();
+}
+
+module ParameterizedModule<InputSig Input> { }
+
+private module Input1 implements InputSig {
+  predicate foo() { any() }
+}
+
+private module Input2 implements InputSig {
+  predicate foo() { any() }
+}
+
+private module Input3 implements InputSig {
+  predicate foo() { any() }
+}
+
+module M1 = ParameterizedModule<Input1>;
+
+private module M2 = ParameterizedModule<Input2>;
+
+import ParameterizedModule<Input3>
+
+private module MImpl { }
+
+module MPublic = MImpl;
+
+private class CImpl1 extends AstNode { }
+
+final class CPublic1 = CImpl1;
+
+private class CImpl2 extends AstNode { }