run a late dce pass to clean up extra cruft.

llvm-svn: 35684

llvm/tools/llvm-ld/Optimize.cpp

@@ -201,6 +201,7 @@ void Optimize(Module* M) {
   if (!DisableOptimizations) {
     addPass(Passes, createInstructionCombiningPass());
     addPass(Passes, createCFGSimplificationPass());
+    addPass(Passes, createDeadCodeEliminationPass());
     addPass(Passes, createGlobalDCEPass());
   }