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/compiler/linker/file_output_stream.h b/compiler/linker/file_output_stream.h
index 28296a4..deb051f 100644
--- a/compiler/linker/file_output_stream.h
+++ b/compiler/linker/file_output_stream.h
@@ -17,9 +17,9 @@
 #ifndef ART_COMPILER_LINKER_FILE_OUTPUT_STREAM_H_
 #define ART_COMPILER_LINKER_FILE_OUTPUT_STREAM_H_
 
-#include "output_stream.h"
+#include "base/os.h"
 
-#include "os.h"
+#include "output_stream.h"
 
 namespace art {
 namespace linker {