[SDAG] Read-only intrinsics must have WillReturn to be treated as loads

Author: kalxr

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -5227,7 +5227,7 @@ void SelectionDAGBuilder::visitTargetIntrinsic(const CallInst &I,
   // definition.
   const Function *F = I.getCalledFunction();
   bool HasChain = !F->doesNotAccessMemory();
-  bool OnlyLoad = HasChain && F->onlyReadsMemory();
+  bool OnlyLoad = HasChain && F->onlyReadsMemory() && F->willReturn();
 
   // Build the operand list.
   SmallVector<SDValue, 8> Ops;