Object: replace backslashes with slashes in embedded relative thin archive paths on Windows.

This makes these thin archives portable between *nix and Windows.

Differential Revision: https://reviews.llvm.org/D26696

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287038 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed