[svn r382] In CastExp, after the cast to CastExp.to force the type to be CastExp.type.

This is used for c.im for instance, where the cast is to idouble but type is double.

gen/toir.cpp

@@ -1250,6 +1250,8 @@ DValue* CastExp::toElem(IRState* p)
 
     DValue* u = e1->toElem(p);
     DValue* v = DtoCast(u, to);
+    // force d type to this->type
+    v->getType() = type;
 
     if (v->isSlice()) {
         // only valid as rvalue!