[lldb] Auto-enable swift health logging to memory buffer

Author: kastiglione

lldb/source/Utility/Logging.cpp

@@ -59,12 +59,19 @@ static constexpr Log::Category g_swift_categories[] = {
 
 static Log::Channel g_swift_log_channel(g_swift_categories, LIBLLDB_SWIFT_LOG_HEALTH);
 
+static std::string g_swift_log_buffer;
+
 #endif
 
 void lldb_private::InitializeLldbChannel() {
   Log::Register("lldb", g_log_channel);
 #ifdef LLDB_ENABLE_SWIFT
   Log::Register("swift", g_swift_log_channel);
+
+  llvm::raw_null_ostream error_stream;
+  Log::EnableLogChannel(
+      std::make_shared<llvm::raw_string_ostream>(g_swift_log_buffer),
+      LLDB_LOG_OPTION_THREADSAFE, "swift", {"health"}, error_stream);
 #endif
 }