revert my previous commit (r159173), since as Eli pointed out, it's perfectly ok to mark realloc as noalias

llvm-svn: 159175

llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp

@@ -1942,6 +1942,7 @@ void SimplifyLibCalls::inferPrototypeAttributes(Function &F) {
           !FTy->getReturnType()->isPointerTy())
         return;
       setDoesNotThrow(F);
+      setDoesNotAlias(F, 0);
       setDoesNotCapture(F, 1);
     } else if (Name == "read") {
       if (FTy->getNumParams() != 3 ||

llvm/test/Transforms/SimplifyLibCalls/2009-01-04-Annotate.ll

@@ -1,5 +1,5 @@
 ; RUN: opt < %s -simplify-libcalls -S > %t
-; RUN: grep noalias %t | count 1
+; RUN: grep noalias %t | count 2
 ; RUN: grep nocapture %t | count 3
 ; RUN: grep nounwind %t | count 3
 ; RUN: grep readonly %t | count 1