[llvm-cxxdump] Remove duplicate code check.

We already fail with 'No such file or directory' when we try to open
the file -- if that doesn't exist. Also add a test to verify this behavior.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247744 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed