Add NoDuplicate to coro.promise

Author: NewSigma

llvm/lib/Transforms/Coroutines/CoroEarly.cpp

@@ -168,6 +168,7 @@ void Lowerer::hidePromiseAlloca(CoroIdInst *CoroId, CoroBeginInst *CoroBegin) {
   SmallVector<Value *, 3> Arg{CoroBegin, Alignment, FromPromise};
   auto *PI = Builder.CreateIntrinsic(
       Builder.getPtrTy(), Intrinsic::coro_promise, Arg, {}, "promise.addr");
+  PI->setCannotDuplicate();
   PA->replaceUsesWithIf(PI, [CoroId](Use &U) {
     bool IsBitcast = U == U.getUser()->stripPointerCasts();
     bool IsCoroId = U.getUser() == CoroId;

llvm/lib/Transforms/Coroutines/Coroutines.cpp

@@ -288,6 +288,8 @@ void coro::Shape::analyze(Function &F,
         }
         break;
       case Intrinsic::coro_promise:
+        assert(CoroPromise == nullptr &&
+               "CoroEarly must ensure coro.promise unique");
         CoroPromise = cast<CoroPromiseInst>(II);
         break;
       }