Fixed .funcptr property of delegates, no longer uses the infamous DMD rewrites to pointer arithmetic, instead a GEPExp has been introduced.

tests/mini/complex5.d

@@ -9,5 +9,5 @@ void main()
 void foo(cfloat c)
 {
     assert(c.re > 2.9999  && c.re < 3.0001);
-    assert(c.im > 1.9999i && c.im < 2.0001);
+    assert(c.im > 1.9999i && c.im < 2.0001i);
 }

tests/mini/dgfuncptr.d

@@ -5,5 +5,5 @@ void main()
   auto dg = &foo;
 
   if(dg.funcptr is null)
-  {}
+  { assert(0); }
 }