MIPS: Fix [de]serialize problem of root objects.

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index c48e7e4510c31d6afa8ea8dc84d3e7a0c5a20382..b2c4510c68917e2821aeb1b1f8a17c313ce03651 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -466,9 +466,6 @@
 
   # Currently always deopt on minus zero
   'math-floor-of-div-minus-zero': [SKIP],
-
-  # BUG(v8:3457).
-  'deserialize-reference': [SKIP],
 }],  # 'arch == mipsel or arch == mips'
 
 ##############################################################################
@@ -520,9 +517,6 @@
 
   # Currently always deopt on minus zero
   'math-floor-of-div-minus-zero': [SKIP],
-
-  # BUG(v8:3457).
-  'deserialize-reference': [SKIP],
 }],  # 'arch == mips64el'
 
 ['arch == mips64el and simulator_run == False', {