Merge "Support proc macros from metadata too." into main am: a68af6adc8 am: 8c94f34b9b

Original change: https://android-review.googlesource.com/c/platform/development/+/2799377

Change-Id: Iab0809fb317a54643a91a3cd381efe8e518d0d81
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>