Add a public accessor for GlobalCtors in CodeGenModule

[loladiro]

Summary

I'm using clang in a JIT context where I found it useful to be able to
access the GlobalCtors and especially clear them once I have emitted
and called them. I'd like to add a public method to be able to access
the list. Thoughts?

[yaron.keren]

That's for Julia, right?

I'm reminded of the discussion

http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20140825/113355.html

other than the "we should have a more complete ModuleBuilder API instead of going CodeGenModule" the patch LGTM.

[loladiro]

Yes, this is for Julia, or more specifically, the julia C++ FFI at https://github.com/Keno/Cxx.jl. I'm not sure my project is far enough along yet to be able to say which of the codegen APIs I will end up needing, but once I get to that point I'll start a discussion on properly moving them to the public headers (if that discussion doesn't start before then).

Thanks for the LGTM, I'll go ahead and commit this then.

cfe/trunk/lib/CodeGen/CodeGenModule.h

 };
 
 /// This class organizes the cross-function state that is used while generating
 /// LLVM code.
 class CodeGenModule : public CodeGenTypeCache {
   CodeGenModule(const CodeGenModule &) LLVM_DELETED_FUNCTION;
   void operator=(const CodeGenModule &) LLVM_DELETED_FUNCTION;
 
+public:
   struct Structor {
     Structor() : Priority(0), Initializer(nullptr), AssociatedData(nullptr) {}
     Structor(int Priority, llvm::Constant *Initializer,
              llvm::Constant *AssociatedData)
         : Priority(Priority), Initializer(Initializer),
           AssociatedData(AssociatedData) {}
     int Priority;
     llvm::Constant *Initializer;
     llvm::Constant *AssociatedData;
   };
 
   typedef std::vector<Structor> CtorList;
 
+private:
   ASTContext &Context;
   const LangOptions &LangOpts;
   const CodeGenOptions &CodeGenOpts;
   llvm::Module &TheModule;
   DiagnosticsEngine &Diags;
   const llvm::DataLayout &TheDataLayout;
   const TargetInfo &Target;
   std::unique_ptr<CGCXXABI> ABI;
public:
   ItaniumVTableContext &getItaniumVTableContext() {
     return VTables.getItaniumVTableContext();
   }
 
   MicrosoftVTableContext &getMicrosoftVTableContext() {
     return VTables.getMicrosoftVTableContext();
   }
 
+  CtorList &getGlobalCtors() { return GlobalCtors; }
+  CtorList &getGlobalDtors() { return GlobalDtors; }
+
   llvm::MDNode *getTBAAInfo(QualType QTy);
   llvm::MDNode *getTBAAInfoForVTablePtr();
   llvm::MDNode *getTBAAStructInfo(QualType QTy);
   /// Return the MDNode in the type DAG for the given struct type.
   llvm::MDNode *getTBAAStructTypeInfo(QualType QTy);
   /// Return the path-aware tag for given base type, access node and offset.
   llvm::MDNode *getTBAAStructTagInfo(QualType BaseTy, llvm::MDNode *AccessN,
                                      uint64_t O);