Add separate boolean arrays with just true or false

This simplifies locally changing parameterized tests to only run a
subset of tests.

Change-Id: I58f2956057ce11422b5171cc400d5f410170f60f
diff --git a/src/main/java/com/android/tools/r8/utils/BooleanUtils.java b/src/main/java/com/android/tools/r8/utils/BooleanUtils.java
index 75d47f6..e99ff55 100644
--- a/src/main/java/com/android/tools/r8/utils/BooleanUtils.java
+++ b/src/main/java/com/android/tools/r8/utils/BooleanUtils.java
@@ -6,6 +6,8 @@
 public class BooleanUtils {
 
   private static final Boolean[] VALUES = new Boolean[] { Boolean.TRUE, Boolean.FALSE };
+  private static final Boolean[] TRUE_VALUES = new Boolean[] {Boolean.TRUE};
+  private static final Boolean[] FALSE_VALUES = new Boolean[] {Boolean.FALSE};
 
   public static int intValue(boolean value) {
     return value ? 1 : 0;
@@ -18,4 +20,12 @@
   public static Boolean[] values() {
     return VALUES;
   }
+
+  public static Boolean[] trueValues() {
+    return TRUE_VALUES;
+  }
+
+  public static Boolean[] falseValues() {
+    return FALSE_VALUES;
+  }
 }