[llvm-objdump] Issue error message when object file cannot be created
[llvm-objdump] Issue error message when object file cannot be created

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@330364 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit c475d7913dc6e446f7b235c3b9e2383062414a44)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm