[LIR] Default enable the use of light-weight IR.

Bug: b/225838009
Change-Id: I804ff8c6dd0e1785f6dcf56529cf8240a94e5212
diff --git a/src/main/java/com/android/tools/r8/utils/InternalOptions.java b/src/main/java/com/android/tools/r8/utils/InternalOptions.java
index 3e1101d..bcc824d 100644
--- a/src/main/java/com/android/tools/r8/utils/InternalOptions.java
+++ b/src/main/java/com/android/tools/r8/utils/InternalOptions.java
@@ -2086,7 +2086,7 @@
   public static class TestingOptions {
 
     public boolean roundtripThroughLir = false;
-    private boolean useLir = System.getProperty("com.android.tools.r8.uselir") != null;
+    private boolean useLir = System.getProperty("com.android.tools.r8.nolir") == null;
 
     public void enableLir() {
       useLir = true;