Added code in the Host layer that can report system log messages
so that we don't have "fprintf (stderr, ...)" calls sprinkled everywhere.
Changed all needed locations over to using this.

For non-darwin, we log to stderr only. On darwin, we log to stderr _and_
to ASL (Apple System Log facility). This will allow GUI apps to have a place
for these error and warning messages to go, and also allows the command line
apps to log directly to the terminal.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@147596 91177308-0d34-0410-b5e6-96231b3b80d8
19 files changed