Disable nonnull tracking in D8

Bug: 137168535
Change-Id: I2c3ca0c4ffaa986268f60ba686491d14402fca60
diff --git a/src/main/java/com/android/tools/r8/D8Command.java b/src/main/java/com/android/tools/r8/D8Command.java
index f427e0f..7cb5454 100644
--- a/src/main/java/com/android/tools/r8/D8Command.java
+++ b/src/main/java/com/android/tools/r8/D8Command.java
@@ -250,6 +250,7 @@
     internal.minApiLevel = getMinApiLevel();
     internal.intermediate = intermediate;
     internal.readCompileTimeAnnotations = intermediate;
+
     // Assert and fixup defaults.
     assert !internal.isShrinking();
     assert !internal.isMinifying();
@@ -269,6 +270,8 @@
     assert !internal.enableLambdaMerging;
     assert !internal.enableTreeShakingOfLibraryMethodOverrides;
 
+    // TODO(b/137168535) Disable non-null tracking for now.
+    internal.enableNonNullTracking = false;
     internal.enableDesugaring = getEnableDesugaring();
     internal.enableInheritanceClassInDexDistributor = isOptimizeMultidexForLinearAlloc();
     // This is currently only used for testing.