Revert r278065 while I investigate some build-bot breakage.

llvm-svn: 278069
diff --git a/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h b/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
index db9c519..805852b 100644
--- a/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
+++ b/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
@@ -116,13 +116,11 @@
     LinkingResolver(OrcMCJITReplacement &M) : M(M) {}
 
     JITSymbol findSymbol(const std::string &Name) override {
-      return M.ClientResolver->findSymbol(Name);
+      return M.findMangledSymbol(Name);
     }
 
     JITSymbol findSymbolInLogicalDylib(const std::string &Name) override {
-      if (auto Sym = M.findMangledSymbol(Name))
-        return Sym;
-      return M.ClientResolver->findSymbolInLogicalDylib(Name);
+      return M.ClientResolver->findSymbol(Name);
     }
 
   private:
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
index 0c69b1a..1770525 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -226,24 +226,6 @@
       // Compute JIT symbol flags.
       JITSymbolFlags JITSymFlags = JITSymbolFlags::fromObjectSymbol(*I);
 
-      // If this is a weak definition, check to see if there's a strong one.
-      // If there is, skip this symbol (we won't be providing it: the strong
-      // definition will). If there's no strong definition, make this definition
-      // strong.
-      if (JITSymFlags.isWeak()) {
-        // First check whether there's already a definition in this instance.
-        // FIXME: Override existing weak definitions with strong ones.
-        if (GlobalSymbolTable.count(Name))
-          continue;
-        // Then check the symbol resolver to see if there's a definition
-        // elsewhere in this logical dylib.
-        if (auto Sym = Resolver.findSymbolInLogicalDylib(Name))
-          if (Sym.getFlags().isStrongDefinition())
-            continue;
-        // else
-        JITSymFlags &= ~JITSymbolFlags::Weak;
-      }
-
       if (Flags & SymbolRef::SF_Absolute &&
           SymType != object::SymbolRef::ST_File) {
         uint64_t Addr = 0;