Merge "Adjust testMutate to not rely on undefined behavior" into pi-dev am: 8ee5b8ff3d am: 1d3e96b1a7 am: edcc3812ca am: eeeeef308d

Original change: https://googleplex-android-review.googlesource.com/c/platform/cts/+/14885513

Change-Id: I4383bffc9a72196230c3c0abbe7f64489eda7df8