Add option to append to the cfg dump.

This makes life easier when verifying tests with unresolved classes
(which call dex2oat at rutime).

Change-Id: I7985b2b7c0f343462e03a26b8395297c810b1d95
diff --git a/compiler/common_compiler_test.cc b/compiler/common_compiler_test.cc
index 4b67884..1727657 100644
--- a/compiler/common_compiler_test.cc
+++ b/compiler/common_compiler_test.cc
@@ -192,7 +192,7 @@
                                               GetImageClasses(),
                                               GetCompiledClasses(),
                                               GetCompiledMethods(),
-                                              2, true, true, "", timer_.get(), -1, ""));
+                                              2, true, true, "", false, timer_.get(), -1, ""));
   }
   // We typically don't generate an image in unit tests, disable this optimization by default.
   compiler_driver_->SetSupportBootImageFixup(false);