Fix elf_writer_test for 64b target

The path to the core oat file is dependent on the bit-ness.

Change-Id: I725b9b0f760ae14d0c38d747ad31821da7445dec
diff --git a/compiler/elf_writer_test.cc b/compiler/elf_writer_test.cc
index 8175c35..864dadc 100644
--- a/compiler/elf_writer_test.cc
+++ b/compiler/elf_writer_test.cc
@@ -50,7 +50,11 @@
     CHECK(host_dir != NULL);
     elf_filename = StringPrintf("%s/framework/core.oat", host_dir);
   } else {
+#ifdef __LP64__
+    elf_filename = "/data/art-test64/core.oat";
+#else
     elf_filename = "/data/art-test/core.oat";
+#endif
   }
   LOG(INFO) << "elf_filename=" << elf_filename;