Merge "printflags: print flags declared in mainline module" into main am: 040dc611

Original change: https://android-review.googlesource.com/c/platform/build/+/2986754



Change-Id: I233f6a70616d76febca470c79c097d856ceebbc6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>