[automerger skipped] Revert "Migrate libcore benchmarks to BenchmarkRule" am: 13e69db0db -s ours am: 26ac7c8bce -s ours

am skip reason: Merged-In I309cb9a23102a9ae3680052fa92cd365dacd1443 with SHA-1 93da8e816f is already in history. Merged-In was found from reverted change.

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3259673

Change-Id: I8a2a5a6924467d32f6c758b0a8bdf67100001145
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>