[lld-link] Replace message(...) with Msg(ctx)

to avoid the global ctx.

Author: MaskRay

lld/COFF/Driver.cpp

@@ -1638,7 +1638,7 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
   // because it doesn't start with "/", but we deliberately chose "--" to
   // avoid conflict with /version and for compatibility with clang-cl.
   if (args.hasArg(OPT_dash_dash_version)) {
-    message(getLLDVersion());
+    Msg(ctx) << getLLDVersion();
     return;
   }
 

lld/COFF/DriverUtils.cpp

@@ -922,7 +922,7 @@ opt::InputArgList ArgParser::parse(ArrayRef<const char *> argv) {
     std::string msg = "Command line:";
     for (const char *s : expandedArgv)
       msg += " " + std::string(s);
-    message(msg);
+    Msg(ctx) << msg;
   }
 
   // Save the command line after response file expansion so we can write it to

lld/COFF/PDB.cpp

@@ -1317,7 +1317,7 @@ void PDBLinker::printStats() {
     printLargeInputTypeRecs("IPI", tMerger.ipiCounts, tMerger.getIDTable());
   }
 
-  message(buffer);
+  Msg(ctx) << buffer;
 }
 
 void PDBLinker::addNatvisFiles() {