Merge "printflags: print flags declared in mainline module" into main am: 040dc611 am: ad18d1f1

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



Change-Id: I50cd8a30a9d8239661926b4c17b5aacb55974b22
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>