uint32_t options -> File::OpenOptions options

This patch re-types everywhere that passes a File::OpenOptions
as a uint32_t so it actually uses File::OpenOptions.

It also converts some OpenOptions related functions that fail
by returning 0 or NULL into llvm::Expected

split off from https://reviews.llvm.org/D68737

Reviewers: JDevlieghere, jasonmolenda, labath

Reviewed By: labath

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D68853

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@374817 91177308-0d34-0410-b5e6-96231b3b80d8
24 files changed