Skip box2d for gc stress.

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 723f0e8c8de4e89e16f3dda89ea292cd30c9609b..d4bca37d6d2603ec758243d2f4c405d3aa265b29 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -202,7 +202,7 @@
   'math-floor-of-div-nosudiv': [PASS, SLOW, ['arch not in [arm, arm64, android_arm, android_arm64]', SKIP]],
 
   # Too slow for slow variants.
-  'asm/embenchen/*': [PASS, FAST_VARIANTS]
+  'asm/embenchen/*': [PASS, FAST_VARIANTS],
 }],  # ALWAYS
 
 ##############################################################################
@@ -245,6 +245,9 @@
   'math-floor-of-div': [PASS, NO_VARIANTS],
   'unicodelctest': [PASS, NO_VARIANTS],
   'unicodelctest-no-optimization': [PASS, NO_VARIANTS],
+
+  # Too slow for gc stress.
+  'asm/embenchen/box2d': [SKIP],
 }],  # 'gc_stress == True'
 
 ##############################################################################