Merge "[HWASan] add comment to explain why we can use __has_feature" am: 26e0e00279 am: f04c163217 am: 8d60940a21 am: 28f93db5a7

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

Change-Id: I7b4ef2fec7b4a16867214592bb5c1770205c2c66
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>