r181393 - Debug Info: Using declarations/DW_TAG_imported_declaration of variables, types, and functions.

[Eric Christopher]

> +llvm::DIDescriptor CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
> +  if (const TypeDecl *RD = dyn_cast<TypeDecl>(D))
> +    return CreatePointeeType(QualType(RD->getTypeForDecl(), 0), llvm::DIFile());

CreatePointeeType?

> +  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator I =
> +      DeclCache.find(D->getCanonicalDecl());
> +  if (I == DeclCache.end())
> +    return llvm::DIDescriptor();
> +  llvm::Value *V = I->second;
> +  return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));

This block could use a comment, actually if you could comment the decl
cache stuff in general that would be better.

-eric