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/debug/dwarf/headers.h b/compiler/debug/dwarf/headers.h
index 146d9fd..28f1084 100644
--- a/compiler/debug/dwarf/headers.h
+++ b/compiler/debug/dwarf/headers.h
@@ -19,13 +19,13 @@
 
 #include <cstdint>
 
+#include "base/array_ref.h"
 #include "debug/dwarf/debug_frame_opcode_writer.h"
 #include "debug/dwarf/debug_info_entry_writer.h"
 #include "debug/dwarf/debug_line_opcode_writer.h"
 #include "debug/dwarf/dwarf_constants.h"
 #include "debug/dwarf/register.h"
 #include "debug/dwarf/writer.h"
-#include "utils/array_ref.h"
 
 namespace art {
 namespace dwarf {