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

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

Change-Id: I589aff9fdca6a05f3c0629d364c130fed2650ab9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>