Remember sysroot in Driver. Pass it down to ld for NetBSD, FreeBSD
and DragonFly. Use the --sysroot= form for Linux. Fix handling of =
prefix for -B.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127994 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed