Enable use of keep annotations for r8lib

Bug: b/248408342
Change-Id: Ia27bba9d7c5eee1a99b0c86ec8aa00e739164fd3
diff --git a/tools/create_r8lib.py b/tools/create_r8lib.py
index 93bfcbd..e8bf4f2 100755
--- a/tools/create_r8lib.py
+++ b/tools/create_r8lib.py
@@ -94,6 +94,7 @@
         cmd.extend([
             '-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005'
         ])
+    cmd.append('-Dcom.android.tools.r8.enableKeepAnnotations=1')
     cmd.extend(['-cp', args.r8compiler, 'com.android.tools.r8.R8'])
     cmd.append(args.r8jar)
     if args.debug_variant: