Move code related to debug info generation to its own directory.

debug/dwarf/ contains helper classes which hide the details
of the DWARF file format. It acts as independent DWARF library.

debug/ contains ART-specific code which generates ELF debug
sections (which includes non-DWARF sections like .symtab).

Change-Id: Id351f604e4e64be2ca395a78324ea02e30481497
diff --git a/compiler/oat_test.cc b/compiler/oat_test.cc
index cff2f47..894d29e 100644
--- a/compiler/oat_test.cc
+++ b/compiler/oat_test.cc
@@ -21,20 +21,20 @@
 #include "common_compiler_test.h"
 #include "compiled_method.h"
 #include "compiler.h"
+#include "debug/method_debug_info.h"
 #include "dex/pass_manager.h"
 #include "dex/quick/dex_file_to_method_inliner_map.h"
 #include "dex/quick_compiler_callbacks.h"
 #include "dex/verification_results.h"
 #include "driver/compiler_driver.h"
 #include "driver/compiler_options.h"
-#include "dwarf/method_debug_info.h"
 #include "elf_writer.h"
 #include "elf_writer_quick.h"
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "linker/vector_output_stream.h"
 #include "mirror/class-inl.h"
-#include "mirror/object_array-inl.h"
 #include "mirror/object-inl.h"
+#include "mirror/object_array-inl.h"
 #include "oat_file-inl.h"
 #include "oat_writer.h"
 #include "scoped_thread_state_change.h"