Fix uninitialized fields in the BinaryOperation ast node.
Fix uninitialized fields in the BinaryOperation ast node.

R=jkummerow@chromium.org, svenpanne@chromium.org
BUG=chromium:429194
LOG=n

Review URL: https://codereview.chromium.org/701533002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25077}
git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@25077 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh