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
diff --git a/runtime/read_barrier-inl.h b/runtime/read_barrier-inl.h
index a77d100..58f6c04 100644
--- a/runtime/read_barrier-inl.h
+++ b/runtime/read_barrier-inl.h
@@ -19,6 +19,7 @@
 
 #include "read_barrier.h"
 
+#include "base/utils.h"
 #include "gc/accounting/read_barrier_table.h"
 #include "gc/collector/concurrent_copying-inl.h"
 #include "gc/heap.h"
@@ -26,7 +27,6 @@
 #include "mirror/object_reference.h"
 #include "mirror/reference.h"
 #include "runtime.h"
-#include "utils.h"
 
 namespace art {