Disable mjsunit/wasm/js-api on GC stress bots.

Bug: chromium:751825
No-Tree-Checks: true
Change-Id: I8e9e5c030dca001a8dc881d8fdeefa5c140f3792
Reviewed-on: https://chromium-review.googlesource.com/599047Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47101}

test/mjsunit/mjsunit.status

@@ -245,6 +245,9 @@
 
   # BUG(v8:4779): Crashes flakily with stress mode on arm64.
   'array-splice': [PASS, SLOW, ['arch == arm64', FAST_VARIANTS]],
+
+  # BUG(chromium:751825): Crashes flakily.
+  'wasm/js-api': [SKIP],
 }],  # 'gc_stress == True'
 
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