add test case

Author: yuxuanchen1997

llvm/test/Transforms/Coroutines/gh114487-crash-in-cgscc.ll

@@ -0,0 +1,32 @@
+; Verify that we don't crash when eliding coro_elide_safe callsites.
+; RUN: opt < %s -passes='cgscc(function<>(simplifycfg<>),function-attrs,coro-split,coro-annotation-elide)'  -S | FileCheck %s
+
+; CHECK-LABEL: define void @foo()
+define void @foo() presplitcoroutine personality ptr null {
+entry:
+  %0 = call token @llvm.coro.save(ptr null)
+  br label %branch
+
+branch:
+; Check that we don't call bar at all. 
+; CHECK-NOT: call void @bar{{.*}}
+  call void @bar() coro_elide_safe
+; CHECK: call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr @bar.resumers)
+  ret void
+}
+
+; CHECK-LABEL: define void @bar()
+define void @bar() presplitcoroutine personality ptr null {
+entry:
+  %0 = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null)
+  %1 = call ptr @llvm.coro.begin(token %0, ptr null)
+  %2 = call token @llvm.coro.save(ptr null)
+  %3 = call i8 @llvm.coro.suspend(token none, i1 false)
+  ret void
+}
+
+declare token @llvm.coro.id(i32, ptr readnone, ptr nocapture readonly, ptr) nounwind
+declare ptr @llvm.coro.begin(token, ptr writeonly) nounwind
+declare token @llvm.coro.save(ptr) nomerge nounwind
+declare i8 @llvm.coro.suspend(token, i1) nounwind
+