Move ArrayRef to runtime/base

Will be used in upcoming CLs regarding VDEX and VerifierDeps.

Test: m test-art-host
Change-Id: I68e611a4a52246c2bdf45eab7c61f3212908afd4
diff --git a/compiler/elf_writer.h b/compiler/elf_writer.h
index c9ea0083..f8f9102 100644
--- a/compiler/elf_writer.h
+++ b/compiler/elf_writer.h
@@ -22,10 +22,10 @@
 #include <string>
 #include <vector>
 
+#include "base/array_ref.h"
 #include "base/macros.h"
 #include "base/mutex.h"
 #include "os.h"
-#include "utils/array_ref.h"
 
 namespace art {