[wasm] Enable grow_memory tests on gc_stress

R=bradnelson@chromium.org, ahaas@chromium.org

BUG=5553

Review-Url: https://codereview.chromium.org/2662153002
Cr-Commit-Position: refs/heads/master@{#42801}

test/mjsunit/mjsunit.status

@@ -611,12 +611,6 @@
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
-##############################################################################
-['variant == stress or variant == turbofan_opt', {
-  # BUG(v8:5553).
-  'wasm/grow-memory': [SKIP],
-}],  # variant == stress or variant == turbofan_opt
-
 ##############################################################################
 ['variant == asm_wasm', {
   # Skip stuff uninteresting for asm.js