Never compile a redirecting factory (issue 6697).

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
===================================================================
--- runtime/vm/compiler.cc	(revision 14901)
+++ runtime/vm/compiler.cc	(working copy)
@@ -536,7 +536,9 @@
   for (int i = 0; i < functions.Length(); i++) {
     func ^= functions.At(i);
     ASSERT(!func.IsNull());
-    if (!func.HasCode() && !func.is_abstract()) {
+    if (!func.HasCode() &&
+        !func.is_abstract() &&
+        !func.IsRedirectingFactory()) {
       error = CompileFunction(func);
       if (!error.IsNull()) {
         return error.raw();