Update the tests.

- Change all load_base to load_bias in the test files.
- Add the test files to the backtrace_test.
- Add a function to get the path to the test libraries.
- Change aarch64 to arm64 for offline test code.
- Modify the offline tests so that they can be easily updated when
  unwinding on any arch for any other arch is possible.
- Add tests of CreateNew for remote debugging.

Test: Ran unit tests on host and angler.
Change-Id: Id6c5afe73aeb2ac22463dd81f061799fcb1c178b
diff --git a/libbacktrace/Android.bp b/libbacktrace/Android.bp
index 4190403..e889bdd 100644
--- a/libbacktrace/Android.bp
+++ b/libbacktrace/Android.bp
@@ -243,6 +243,13 @@
             static_libs: ["libutils"],
         },
     },
+
+    data: [
+        "testdata/arm/*",
+        "testdata/arm64/*",
+        "testdata/x86/*",
+        "testdata/x86_64/*",
+    ],
 }
 
 cc_benchmark {