Fix build by moving to clang.

G++ is trying to parse `if (it1->end < it2->end)` with `< it->` being
interpreted as a template parameter. Move to clang.

Bug: 18466763
Change-Id: Idf6fcdbc08963ce2b1cbe0668d25bfa39e0be38d
(cherry picked from commit cfb846e28c4d447eeb094a5578f13f7eb83333e2)
1 file changed