[Common] Discard the temp file while keeping the memory mapping open, on errors
[Common] Discard the temp file while keeping the memory mapping open, on errors

Differential Revision: https://reviews.llvm.org/D51095

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@340635 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld