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/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 4c1408a..8d41595 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -345,8 +345,9 @@
                                std::unordered_set<std::string>* compiled_classes,
                                std::unordered_set<std::string>* compiled_methods,
                                size_t thread_count, bool dump_stats, bool dump_passes,
-                               const std::string& dump_cfg_file_name, CumulativeLogger* timer,
-                               int swap_fd, const std::string& profile_file)
+                               const std::string& dump_cfg_file_name, bool dump_cfg_append,
+                               CumulativeLogger* timer, int swap_fd,
+                               const std::string& profile_file)
     : swap_space_(swap_fd == -1 ? nullptr : new SwapSpace(swap_fd, 10 * MB)),
       swap_space_allocator_(new SwapAllocator<void>(swap_space_.get())),
       profile_present_(false), compiler_options_(compiler_options),
@@ -372,6 +373,7 @@
       dump_stats_(dump_stats),
       dump_passes_(dump_passes),
       dump_cfg_file_name_(dump_cfg_file_name),
+      dump_cfg_append_(dump_cfg_append),
       timings_logger_(timer),
       compiler_context_(nullptr),
       support_boot_image_fixup_(instruction_set != kMips && instruction_set != kMips64),