__attribute__((aligned(MaxCacheLineSize))) triggers a GCC bug because enum {MaxCacheLineSize = 64 }; isn't constant enough. Adding zero to it makes it that much more constant.

R= stichnot@chromium.org
BUG= https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55382

Review URL: https://codereview.chromium.org/867483004