Merge "simpleperf: Separate EOF and error in ReadFileFeature." am: 44a93514a3 am: 1d6ff4da02

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2430953

Change-Id: I54269d7a9347d7ca6d4b8db18db0966bd98d7a21
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>