Add tests to verify that synthetic method removal is performed

These check that direct and indirect clinit wrappers, as well as stub class synthetic
static initialisers, are removed if they are generated but not subsequently called.

Author: smowton

regression/cbmc-java/lazyloading_synthetic_method_cleanup1/Test.class

@@ -0,0 +1,22 @@
+public class Test {
+
+  // Refers to, but never instantiates or refers to static fields of, Unused.
+  // Thus a clinit-wrapper for Unused should be created, but subsequently
+  // discarded.
+  Unused u;
+
+  public static void main() {
+
+  }
+
+}
+
+class Unused {
+
+  static int x;
+
+  static {
+    x = 1;
+  }
+
+}

regression/cbmc-java/lazyloading_synthetic_method_cleanup1/Test.java

@@ -0,0 +1,6 @@
+CORE
+Test.class
+--show-goto-functions
+java::Unused::clinit_wrapper
+Unused\.<clinit>\(\)
+

regression/cbmc-java/lazyloading_synthetic_method_cleanup1/Unused.class

@@ -0,0 +1,6 @@
+CORE
+Test.class
+--lazy-methods --show-goto-functions
+--
+java::Unused::clinit_wrapper
+Unused\.<clinit>\(\)

regression/cbmc-java/lazyloading_synthetic_method_cleanup1/check_clinit_normally_present.desc

@@ -0,0 +1,5 @@
+CORE
+Test.class
+--lazy-methods
+VERIFICATION SUCCESSFUL
+

regression/cbmc-java/lazyloading_synthetic_method_cleanup1/check_clinit_removed_by_lazy_loading.desc

@@ -0,0 +1,26 @@
+public class Test {
+
+  // Refers to, but never instantiates or refers to static fields of, Unused.
+  // Thus a clinit-wrapper for Unused should be created, but subsequently
+  // discarded.
+  Unused1 u;
+
+  public static void main() {
+
+  }
+
+}
+
+class Unused1 extends Unused2 {
+
+}
+
+class Unused2 {
+
+  static int x;
+
+  static {
+    x = 1;
+  }
+
+}