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

include/llvm/CodeGen/TargetLoweringObjectFileImpl.h

@@ -78,6 +78,11 @@ class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
 public:
   virtual ~TargetLoweringObjectFileMachO() {}
 
+  /// emitModuleFlags - Emit the module flags that specify the garbage
+  /// collection information.
+  virtual void emitModuleFlags(MCStreamer &Streamer, NamedMDNode *ModFlags,
+                               Mangler *Mang, const TargetMachine &TM) const;
+
   virtual const MCSection *
   SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
                          Mangler *Mang, const TargetMachine &TM) const;