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_builder.h b/compiler/elf_builder.h
index 7f2e193..02831c9 100644
--- a/compiler/elf_builder.h
+++ b/compiler/elf_builder.h
@@ -21,13 +21,13 @@
 
 #include "arch/instruction_set.h"
 #include "arch/mips/instruction_set_features_mips.h"
+#include "base/array_ref.h"
 #include "base/bit_utils.h"
 #include "base/casts.h"
 #include "base/unix_file/fd_file.h"
 #include "elf_utils.h"
 #include "leb128.h"
 #include "linker/error_delaying_output_stream.h"
-#include "utils/array_ref.h"
 
 namespace art {