Some useful logging.  Also don't stuff the temporary thread into a shared pointer for no apparent reason.
Some useful logging.  Also don't stuff the temporary thread into a shared pointer for no apparent reason.

git-svn-id: b33bab8abb5b18c12ee100cd7761ab452d00b2b0@124108 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb