[PATCH] Remove LoopVectorizationCostModel::AT

[David Blaikie]

Is the warning emitted in a +Asserts build of LLVM? (usually such warnings don't persist long in the codebase, because so many of us build with -Werror +Asserts, so that leaves the clang warnings for -Asserts builds, but you have to be careful that you don't break the +Asserts build when you fix these (eg: the variable may be unused in -Asserts, but used in +Asserts, so removing it will fix the -Asserts warning, but break the +Asserts build))

http://reviews.llvm.org/D5788