Fix performance-faster-string-find clang-tidy issues am: 74e0b53a42

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

Change-Id: I411f6b584d220ce8eb76dc13b992f83ecb9cd0d2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>