Fix performance-faster-string-find clang-tidy issues am: 74e0b53a42 am: 3667d6f33f am: 3793afe197

Original change: https://android-review.googlesource.com/c/platform/art/+/2143534

Change-Id: Ia34fc1f0bd2e6df85581ba2a8011332aa417b218
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>