build: regenerate configure

Regenerate configure script for new option to make the buildbots happy.

Signed-off-by: Saleem Abdulrasool <compnerd@compnerd.org>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173893 91177308-0d34-0410-b5e6-96231b3b80d8