[PATCH] Reload undefined atoms to use possibly new undefines.

[Rui Ueyama]

  Rebased with master. Ping?

http://llvm-reviews.chandlerc.com/D2162

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2162?vs=5493&id=5585#toc

Files:
  lib/Core/Resolver.cpp

Index: lib/Core/Resolver.cpp
===================================================================
--- lib/Core/Resolver.cpp
+++ lib/Core/Resolver.cpp
@@ -111,7 +111,9 @@
       // If the undefined symbol has an alternative name, try to resolve the
       // symbol with the name to give it a second chance. This feature is used
       // for COFF "weak external" symbol.
-      if (!_symbolTable.isDefined(undefName)) {
+      const Atom *maybeUndefAtom = _symbolTable.findByName(undefName);
+      assert(maybeUndefAtom);
+      if (auto *undefAtom = dyn_cast<const UndefinedAtom>(maybeUndefAtom)) {
         if (const UndefinedAtom *fallbackUndefAtom = undefAtom->fallback()) {
           _symbolTable.addReplacement(undefAtom, fallbackUndefAtom);
           _symbolTable.add(*fallbackUndefAtom);
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