Add a "lldb host" logging channel, and put logging in the Host::OpenInExternalEditor code.

git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@112614 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/lldb-log.cpp b/source/lldb-log.cpp
index 57a2072..4e291fa 100644
--- a/source/lldb-log.cpp
+++ b/source/lldb-log.cpp
@@ -151,6 +151,7 @@
             else if (strcasestr(arg, "temp")   == arg)  flag_bits |= LIBLLDB_LOG_TEMPORARY;
             else if (strcasestr(arg, "comm")   == arg)  flag_bits |= LIBLLDB_LOG_COMMUNICATION;
             else if (strcasestr(arg, "conn")   == arg)  flag_bits |= LIBLLDB_LOG_CONNECTION;
+            else if (strcasestr(arg, "host")   == arg)  flag_bits |= LIBLLDB_LOG_HOST;
             else
             {
                 feedback_strm->Printf("error: unrecognized log category '%s'\n", arg);