Add OpenFlags to the create(Unique|Temporary)File interfaces.

This will allow a future F_Delete flag to be specified when we want
the file to be automatically deleted on close.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319117 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed