[wasm] Remove fixed todo

NOTRY=true

R=clemensh@chromium.org

Change-Id: I1d4d2eee771103a91f0b4878056b8cd72e06337c
Reviewed-on: https://chromium-review.googlesource.com/684077Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48159}

test/wasm-spec-tests/wasm-spec-tests.status

@@ -5,7 +5,6 @@
 [
 [ALWAYS, {
   #TODO(ahaas): Add additional stack checks on mips.
-  # Issue 6318: Stack checks for functions with huge stack frames fail on x64 and ia32
   'tests/skip-stack-guard-page': [PASS, ['arch == mipsel or arch == mips64el or ((arch == ppc or arch == ppc64 or arch == s390 or arch == s390x) and simulator_run)', SKIP]],
 }],  # ALWAYS