No need to compare arrays item-by-item if they are the same object.

RELNOTES=none

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=293028181

core/src/main/java/com/google/common/truth/Subject.java

@@ -536,6 +536,9 @@ private static ComparisonResult checkByteArrayEquals(byte[] expected, byte[] act
    */
   private static ComparisonResult checkArrayEqualsRecursive(
       Object expectedArray, Object actualArray, String lastIndex) {
+    if (expectedArray == actualArray) {
+      return ComparisonResult.equal();
+    }
     String expectedType = arrayType(expectedArray);
     String actualType = arrayType(actualArray);
     if (!expectedType.equals(actualType)) {