Create dex subdirectory

Move all the DexFile related source to a common subdirectory dex/ of
runtime.

Bug: 71361973
Test: make -j 50 test-art-host
Change-Id: I59e984ed660b93e0776556308be3d653722f5223
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 9e69e5e..fe83a66 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -42,13 +42,13 @@
 #include "compiler.h"
 #include "compiler_callbacks.h"
 #include "compiler_driver-inl.h"
+#include "dex/dex_file-inl.h"
+#include "dex/dex_file_annotations.h"
+#include "dex/dex_instruction-inl.h"
 #include "dex/dex_to_dex_compiler.h"
 #include "dex/verification_results.h"
 #include "dex/verified_method.h"
 #include "dex_compilation_unit.h"
-#include "dex_file-inl.h"
-#include "dex_file_annotations.h"
-#include "dex_instruction-inl.h"
 #include "driver/compiler_options.h"
 #include "gc/accounting/card_table-inl.h"
 #include "gc/accounting/heap_bitmap.h"