LoopLoadElimination should preserve GlobalsAA.

[efriedma]

Summary

Avoids losing GlobalsAA in the standard pass pipeline.

[anemet]

LGTM.

llvm/trunk/lib/Transforms/Scalar/LoopLoadElimination.cpp

 //
 // The pass can also version the loop and add memchecks in order to prove that
 // may-aliasing stores can't change the value in memory before it's read by the
 // load.
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/GlobalsModRef.h"
 #include "llvm/Analysis/LoopAccessAnalysis.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/ScalarEvolutionExpander.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Transforms/Scalar.h"
public:
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.addRequiredID(LoopSimplifyID);
     AU.addRequired<LoopInfoWrapperPass>();
     AU.addPreserved<LoopInfoWrapperPass>();
     AU.addRequired<LoopAccessLegacyAnalysis>();
     AU.addRequired<ScalarEvolutionWrapperPass>();
     AU.addRequired<DominatorTreeWrapperPass>();
     AU.addPreserved<DominatorTreeWrapperPass>();
+    AU.addPreserved<GlobalsAAWrapperPass>();
   }
 
   static char ID;
 };
 }
 
 char LoopLoadElimination::ID;
 static const char LLE_name[] = "Loop Load Elimination";