Merge "Enable coverage for libc." am: e41012fe2e am: fab04f7527 am: 3fcc2f13f1

Original change: https://android-review.googlesource.com/c/platform/bionic/+/1383511

Change-Id: Ieb5b80fbc8f42f316d2e5e74ff8e45ce07a01a3c