Add support for GNU runtime property set / get structure functions.  Minor refactoring of Mac runtime (returns the same function for both, as the Mac runtimes currently only provide a single entry point for setting and getting struct properties, although this will presumably be fixed at some point).

llvm-svn: 122569
diff --git a/clang/lib/CodeGen/CGObjCRuntime.h b/clang/lib/CodeGen/CGObjCRuntime.h
index c9b0c6d..4720040 100644
--- a/clang/lib/CodeGen/CGObjCRuntime.h
+++ b/clang/lib/CodeGen/CGObjCRuntime.h
@@ -176,8 +176,10 @@
   /// Return the runtime function for setting properties.
   virtual llvm::Constant *GetPropertySetFunction() = 0;
 
-  // API for atomic copying of qualified aggregates in setter/getter.
-  virtual llvm::Constant *GetCopyStructFunction() = 0;
+  // API for atomic copying of qualified aggregates in getter.
+  virtual llvm::Constant *GetGetStructFunction() = 0;
+  // API for atomic copying of qualified aggregates in setter.
+  virtual llvm::Constant *GetSetStructFunction() = 0;
   
   /// GetClass - Return a reference to the class for the given
   /// interface decl.