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/linker/arm64/relative_patcher_arm64.h b/compiler/linker/arm64/relative_patcher_arm64.h
index 48ad105..a4a8018 100644
--- a/compiler/linker/arm64/relative_patcher_arm64.h
+++ b/compiler/linker/arm64/relative_patcher_arm64.h
@@ -17,8 +17,8 @@
 #ifndef ART_COMPILER_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_
 #define ART_COMPILER_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_
 
+#include "base/array_ref.h"
 #include "linker/arm/relative_patcher_arm_base.h"
-#include "utils/array_ref.h"
 
 namespace art {
 namespace linker {