Don't use desugaring for incremental dexing benchmark

This was causing stderr to be spammed so much that the results did not get send back

Change-Id: I83263b89cfc5597f5898079e558c8252ed983883
diff --git a/src/main/java/com/android/tools/r8/benchmarks/IncrementalDexingBenchmark.java b/src/main/java/com/android/tools/r8/benchmarks/IncrementalDexingBenchmark.java
index fec86c5..0aaefd9 100644
--- a/src/main/java/com/android/tools/r8/benchmarks/IncrementalDexingBenchmark.java
+++ b/src/main/java/com/android/tools/r8/benchmarks/IncrementalDexingBenchmark.java
@@ -25,6 +25,7 @@
         D8Command.builder()
             .addProgramFiles(Paths.get("build/test/examples/arithmetic.jar"))
             .setMode(CompilationMode.DEBUG)
+            .setDisableDesugaring(true)
             .setProgramConsumer(
                 new DexIndexedConsumer.ForwardingConsumer(null) {
                   @Override