[heap] Skip regress/regress-678917 in TSAN configuration.

This test uses a lot of memory and is causing OOM crashes on bots.

Bug: v8:7042
Change-Id: I63ff4d44ca8e26b65875df53ebd235976183c558
Reviewed-on: https://chromium-review.googlesource.com/755593
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49161}

test/mjsunit/mjsunit.status

@@ -171,6 +171,9 @@
   # Allocates a large array buffer, which TSAN sometimes cannot handle.
   'regress/regress-599717': [PASS, ['tsan', SKIP]],
 
+  # BUG(v8:7042). Uses a lot of memory.
+  'regress/regress-678917': [PASS, ['tsan', SKIP]],
+
   # BUG(v8:6924). The test uses a lot of memory.
   'regress/wasm/regress-694433': [PASS, ['tsan', SKIP]],