[wasm] Enable some disabled WASM tests

R=ahaas@chromium.org

Bug: chromium:751825, chromium:773631
Change-Id: I87f6e9859b6adfe46adde7bf08fd16978035aa1f
Reviewed-on: https://chromium-review.googlesource.com/1177702Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55165}

test/mjsunit/mjsunit.status

@@ -298,12 +298,6 @@
   # BUG(v8:4779): Crashes flakily with stress mode on arm64.
   'array-splice': [PASS, SLOW, ['arch == arm64', NO_VARIANTS]],
 
-  # BUG(chromium:751825): Crashes flakily.
-  'wasm/js-api': [SKIP],
-
-  # BUG(chromium:773631): Crashes flakily.
-  'wasm/streaming-trap-location': [SKIP],
-
   # BUG(v8:7880): Slow tests.
   'regress/regress-707066': [SKIP],
   'regress/regress-446389': [SKIP],