Move most of runtime/base to libartbase/base

Enforce the layering that code in runtime/base should not depend on
runtime by separating it into libartbase.  Some of the code in
runtime/base depends on the Runtime class, so it cannot be moved yet.
Also, some of the tests depend on CommonRuntimeTest, which itself needs
to be factored (in a subsequent CL).

Bug: 22322814
Test: make -j 50 checkbuild
      make -j 50 test-art-host

Change-Id: I8b096c1e2542f829eb456b4b057c71421b77d7e2
Merged-In: c431b9dc4b23cc950eb313695258df5d89f53b22

(cherry picked from commit c431b9dc4b23cc950eb313695258df5d89f53b22)
diff --git a/runtime/oat_file_assistant.cc b/runtime/oat_file_assistant.cc
index c96d825..5888c37 100644
--- a/runtime/oat_file_assistant.cc
+++ b/runtime/oat_file_assistant.cc
@@ -25,7 +25,9 @@
 
 #include "base/file_utils.h"
 #include "base/logging.h"  // For VLOG.
+#include "base/os.h"
 #include "base/stl_util.h"
+#include "base/utils.h"
 #include "class_linker.h"
 #include "compiler_filter.h"
 #include "dex/art_dex_file_loader.h"
@@ -35,10 +37,8 @@
 #include "gc/space/image_space.h"
 #include "image.h"
 #include "oat.h"
-#include "os.h"
 #include "runtime.h"
 #include "scoped_thread_state_change-inl.h"
-#include "utils.h"
 #include "vdex_file.h"
 #include "class_loader_context.h"