[PATCH] Select new undefined atom rather than old one if other conditions are the same.

[kledzik at apple.com]

================
Comment at: lib/Core/SymbolTable.cpp:192-194
@@ +191,5 @@
+    const UndefinedAtom *newFallback = newUndef->fallback();
+    bool hasDifferentFallback =
+        (existingFallback && newFallback &&
+         existingFallback->name() != newFallback->name());
+    if (hasDifferentFallback) {
----------------
hasDifferentFallback should also be true if one has a fallback and the other does not.


http://llvm-reviews.chandlerc.com/D2161