[LTO] Remove extraneous output
[LTO] Remove extraneous output

Remove some debugging output to stderr that snuck in with r279576.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@279974 91177308-0d34-0410-b5e6-96231b3b80d8

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