Move dex_files_for_oat_file_ to CompilerOptions.

A step toward removing the CompilerDriver dependency from
several classes, including HSharpening and ImageWriter.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: I364ef66511fdf855cb11b12c818a40572b037727
diff --git a/compiler/driver/compiler_options.cc b/compiler/driver/compiler_options.cc
index 3d37b68..cc1af3e 100644
--- a/compiler/driver/compiler_options.cc
+++ b/compiler/driver/compiler_options.cc
@@ -38,6 +38,7 @@
       num_dex_methods_threshold_(kDefaultNumDexMethodsThreshold),
       inline_max_code_units_(kUnsetInlineMaxCodeUnits),
       no_inline_from_(),
+      dex_files_for_oat_file_(),
       image_classes_(),
       boot_image_(false),
       core_image_(false),