Summary:
Caller can provides the list of .so files where some files are
unreadable (e.g linux-vdso.so.1). It's more convenient to handler this in
sancov with warning then making all callers to check files.
Reviewers: aizatsky
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D18103
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263307 91177308-0d34-0410-b5e6-96231b3b80d8