improve decl merging logic to be more correct with
functions.  Patch contributed by Nuno Lopes, thanks!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@43757 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/SemaDecl.cpp b/Sema/SemaDecl.cpp
index 40414b4..7eec3b0 100644
--- a/Sema/SemaDecl.cpp
+++ b/Sema/SemaDecl.cpp
@@ -245,6 +245,11 @@
       Old->getCanonicalType() == New->getCanonicalType()) {
     return New;
   }
+
+  if (New->getBody() == 0 && 
+      Old->getCanonicalType() == New->getCanonicalType()) {
+    return 0;
+  }
   
   // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope.
   // TODO: This is totally simplistic.  It should handle merging functions