[svn r111] Fixed most problems with complex number support and added typeinfo for them.

Added typeinfo ti_C.
Did some changes to the way expressions that have both lvalue and rvalue LLVM values are handled.

test/complex3.d

@@ -4,6 +4,6 @@ void main()
 {
     cfloat c1 = 1f + 0i;
     cfloat c2 = 0f + 0i;
-    //c2 += 1f + 0i;
+    c2 += 1f + 0i;
     //assert(c1 == c2);
 }