Align to the large page size (known as a superpage or huge page). FreeBSD automatically promotes large, superpage-aligned allocations. Differential Revision: https://reviews.llvm.org/D27042 llvm-svn: 287782
These symbols are expected to point to the end of the data segment. Implements http://llvm.org/pr25528. Differential Revision: http://reviews.llvm.org/D14833 llvm-svn: 253637