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/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
index 4215f3c..b6a40a2 100644
--- a/compiler/jit/jit_compiler.cc
+++ b/compiler/jit/jit_compiler.cc
@@ -108,6 +108,7 @@
       /* dump_stats */ false,
       /* dump_passes */ false,
       /* dump_cfg_file_name */ "",
+      /* dump_cfg_append */ false,
       cumulative_logger_.get(),
       /* swap_fd */ -1,
       /* profile_file */ ""));