Push DeclGroup much farther throughout the compiler.  Now the various
productions (except the already broken ObjC cases like @class X,Y;) in 
the parser that can produce more than one Decl return a DeclGroup instead
of a Decl, etc.

This allows elimination of the Decl::NextDeclarator field, and exposes
various clients that should look at all decls in a group, but which were
only looking at one (such as the dumper, printer, etc).  These have been
fixed.

Still TODO:

1) there are some FIXME's in the code about potentially using
DeclGroup for better location info.
2) ParseObjCAtDirectives should return a DeclGroup due to @class etc.
3) I'm not sure what is going on with StmtIterator.cpp, or if it can
   be radically simplified now.
4) I put a truly horrible hack in ParseTemplate.cpp.

I plan to bring up #3/4 on the mailing list, but don't plan to tackle
#1/2 in the short term.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68002 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/clang-cc/RewriteObjC.cpp b/tools/clang-cc/RewriteObjC.cpp
index e0267ec..5fcecc6 100644
--- a/tools/clang-cc/RewriteObjC.cpp
+++ b/tools/clang-cc/RewriteObjC.cpp
@@ -126,7 +126,11 @@
     virtual void Initialize(ASTContext &context);
 
     // Top Level Driver code.
-    virtual void HandleTopLevelDecl(Decl *D);
+    virtual void HandleTopLevelDecl(DeclGroupRef D) {
+      for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I)
+        HandleTopLevelSingleDecl(*I);
+    }
+    void HandleTopLevelSingleDecl(Decl *D);
     void HandleDeclInMainFile(Decl *D);
     RewriteObjC(std::string inFile, std::string outFile,
                 Diagnostic &D, const LangOptions &LOpts);
@@ -550,7 +554,7 @@
 // Top Level Driver Code
 //===----------------------------------------------------------------------===//
 
-void RewriteObjC::HandleTopLevelDecl(Decl *D) {
+void RewriteObjC::HandleTopLevelSingleDecl(Decl *D) {
   // Two cases: either the decl could be in the main file, or it could be in a
   // #included file.  If the former, rewrite it now.  If the later, check to see
   // if we rewrote the #include/#import.
@@ -583,7 +587,7 @@
     for (DeclContext::decl_iterator DI = LSD->decls_begin(),
                                  DIEnd = LSD->decls_end();
          DI != DIEnd; ++DI)
-      HandleTopLevelDecl(*DI);
+      HandleTopLevelSingleDecl(*DI);
   }
   // If we have a decl in the main file, see if we should rewrite it.
   if (SM->isFromMainFile(Loc))