Delete unjustified assert

It's ok to generate <clinit> in the light classes mode, it's not ok to generate
the code in it (currently there seems to be no sane way to assert that)

compiler/backend/src/org/jetbrains/jet/codegen/MemberCodegen.java

@@ -199,11 +199,8 @@ public abstract class MemberCodegen<T extends JetElement/* TODO: & JetDeclaratio
     @NotNull
     protected ExpressionCodegen createOrGetClInitCodegen() {
         DeclarationDescriptor descriptor = context.getContextDescriptor();
-        assert state.getClassBuilderMode() == ClassBuilderMode.FULL
-                : "<clinit> should not be generated for light classes. Descriptor: " + descriptor;
         if (clInit == null) {
             MethodVisitor mv = v.newMethod(OtherOrigin(descriptor), ACC_STATIC, "<clinit>", "()V", null, null);
-            mv.visitCode();
             SimpleFunctionDescriptorImpl clInit =
                     SimpleFunctionDescriptorImpl.create(descriptor, Annotations.EMPTY, Name.special("<clinit>"), SYNTHESIZED);
             clInit.initialize(null, null, Collections.<TypeParameterDescriptor>emptyList(),