Add ability to force compile as 64 bit. am: 3c0ae331

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/soong/+/19295425



Change-Id: Ie0d782c3524de61065d39956f3c85ccc6701fc7a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>