Add code to the target lowering object file module to handle module flags.

The MachO back-end needs to emit the garbage collection flags specified in the
module flags. This is a WIP, so the front-end hasn't been modified to emit these
flags just yet. Documentation and front-end switching to occur soon.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150507 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -857,6 +857,10 @@ bool AsmPrinter::doFinalization(Module &M) {
     EmitVisibility(Name, V, false);
   }
 
+  // Emit module flags.
+  if (NamedMDNode *ModFlags = M.getModuleFlagsMetadata())
+    getObjFileLowering().emitModuleFlags(OutStreamer, ModFlags, Mang, TM);
+
   // Finalize debug and EH information.
   if (DE) {
     {