preserving AA analysis as well

Signed-off-by: Peter Rong <[email protected]>

Author: DataCorrupted

llvm/lib/Transforms/ObjCARC/ObjCARCContract.cpp

@@ -31,6 +31,7 @@
 #include "ProvenanceAnalysis.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/BasicAliasAnalysis.h"
 #include "llvm/Analysis/ObjCARCUtil.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/EHPersonalities.h"
@@ -740,6 +741,8 @@ INITIALIZE_PASS_END(ObjCARCContractLegacyPass, "objc-arc-contract",
 void ObjCARCContractLegacyPass::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addRequired<AAResultsWrapperPass>();
   AU.addRequired<DominatorTreeWrapperPass>();
+  AU.addPreserved<AAResultsWrapperPass>();
+  AU.addPreserved<BasicAAWrapperPass>();
   AU.addPreserved<DominatorTreeWrapperPass>();
 }