DEPS.xwalk: Roll v8-crosswalk (11af067 -> 8ddfc6f).

8ddfc6f Merge pull request #46 from huningxin/fix-context-load
c5c44ed Temporarily disable Distributivity1 test in M37 to pass x64 trybot
5aa07fb Fix invalid native context reference in simd128-tag

BUG=XWALK-2255