If .bss doesn't exist, set _end/end based on .data.
If .bss doesn't exist, set _end/end based on .data.


git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@190753 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld