Add passes for applying SFI sandboxing at the LLVM IR level

lib/Transforms/Scalar/LowerAtomic.cpp

 //===- LowerAtomic.cpp - Lower atomic intrinsics --------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This pass lowers atomic intrinsics to non-atomic form for use in a known
@@ skipping 104 matching lines @@
       bool Changed = false;
       for (BasicBlock::iterator DI = BB.begin(), DE = BB.end(); DI != DE; ) {
         Instruction *Inst = DI++;
         if (FenceInst *FI = dyn_cast<FenceInst>(Inst))
           Changed |= LowerFenceInst(FI);
         else if (AtomicCmpXchgInst *CXI = dyn_cast<AtomicCmpXchgInst>(Inst))
           Changed |= LowerAtomicCmpXchgInst(CXI);
         else if (AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(Inst))
           Changed |= LowerAtomicRMWInst(RMWI);
         else if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
+          LI->setVolatile(false);
           if (LI->isAtomic())
             LowerLoadInst(LI);
         } else if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
+          SI->setVolatile(false);
           if (SI->isAtomic())
             LowerStoreInst(SI);
         }
       }
       return Changed;
     }
   };
 }
 
 char LowerAtomic::ID = 0;
 INITIALIZE_PASS(LowerAtomic, "loweratomic",
                 "Lower atomic intrinsics to non-atomic form",
                 false, false)
 
 Pass *llvm::createLowerAtomicPass() { return new LowerAtomic(); }