Merge "[HWASan] add comment to explain why we can use __has_feature" am: 26e0e00279 am: f04c163217

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2636328

Change-Id: If0921232cb99740c9a293df75eadce4ef488f87b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>