Move dmd files into compiler/

compiler/test/fail_compilation/scope_class.d

@@ -0,0 +1,22 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/scope_class.d(10): Deprecation: `scope` as a type constraint is deprecated.  Use `scope` at the usage site.
+fail_compilation/scope_class.d(12): Error: functions cannot return `scope scope_class.C`
+---
+*/
+
+
+scope class C { int i; }    // Notice the use of `scope` here
+
+C increment(C c)
+{
+    c.i++;
+    return c;
+}
+
+void main()
+{
+    scope C c = new C();
+    c.increment();
+}