Exclude another test from mjsunit.

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 09097db9f52b5728d2abff7dc221fb1bd8afecb7..8c2c4d5a56ced000e7d46fd7d57d1760c3cc7ee2 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -56,6 +56,10 @@ regress/regress-2612: PASS, SKIP if $mode == debug
 regress/regress-crbug-217858: PASS, SKIP if $mode == debug
 
 ##############################################################################
+# Too slow in debug mode for GC stress mode.
+regress/regress-crbug-217858: PASS, SKIP if $mode == debug
+
+##############################################################################
 # These use a built-in that's only present in debug mode. They take
 # too long to run in debug mode on ARM and MIPS.
 fuzz-natives-part*: PASS, SKIP if ($mode == release || $arch == arm || $arch == android_arm || $arch == mipsel)