Merge "Replace DEX_FLAGS by flags for D8 and R8." am: d5a57a56

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2059767



Change-Id: I43703b2d2fbbdfe5094c8d1a396789d985e61fb3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>