Re-commit r289184, "Support: Use a 64-bit seek in raw_fd_ostream::seek()." with a configure-time check for lseek64.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289187 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed