Add a method to StreamFile to line buffer the file.  Use  that in "log enable -f file" to line buffer the log output.

llvm-svn: 124107

use inside lldb (lldb_private::StreamFile, and lldb_private::StreamString).

llvm-svn: 114188

enabled LLVM make style building and made this compile LLDB on Mac OS X. We
can now iterate on this to make the build work on both linux and macosx.

llvm-svn: 108009

llvm-svn: 105712

llvm-svn: 105619