Merge "Allow missing classes in R8 builds" am: a72571f0d1 am: c3ae5578c9

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1597934

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib9679603b87f3bae63fd2e6441b2e55532152148

java/dex.go

@@ -260,6 +260,9 @@ func (d *dexer) r8Flags(ctx android.ModuleContext, flags javaBuilderFlags) (r8Fl
 		r8Flags = append(r8Flags, "--debug")
 	}
 
+	// TODO(b/180878971): missing classes should be added to the relevant builds.
+	r8Flags = append(r8Flags, "-ignorewarnings")
+
 	return r8Flags, r8Deps
 }