[LLD][COFF] Fix pdb loading when the path points to a removable device
[LLD][COFF] Fix pdb loading when the path points to a removable device

Differential Revision: https://reviews.llvm.org/D52666


git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@343366 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld