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/thread_pool_test.cc b/runtime/thread_pool_test.cc
index 28aa21f..895a108 100644
--- a/runtime/thread_pool_test.cc
+++ b/runtime/thread_pool_test.cc
@@ -18,7 +18,7 @@
 
 #include <string>
 
-#include "atomic.h"
+#include "base/atomic.h"
 #include "common_runtime_test.h"
 #include "scoped_thread_state_change-inl.h"
 #include "thread-inl.h"