Fix infinite looping when loading a LLVM bitcode module that has llvm.coro.id.retcon.once intrinsics

rdar://149785911
(cherry picked from commit 2eaa148)
(cherry picked from commit 889ce26)
(cherry picked from commit 031baa1)
(cherry picked from commit 98dd062)

Author: t-rasmud

llvm/lib/IR/AutoUpgrade.cpp

@@ -1073,7 +1073,7 @@ static bool upgradeIntrinsicFunction1(Function *F, Function *&NewFn,
       return true;
     }
 
-    if (F->arg_size() == 6 && Name == "coro.id.retcon.once") {
+    if (!F->isVarArg() && Name == "coro.id.retcon.once") {
       rename(F);
       NewFn = Intrinsic::getDeclaration(F->getParent(),
                                         Intrinsic::coro_id_retcon_once);

llvm/test/Transforms/Coroutines/Inputs/coro-retcon-frame-auto-upgrade-test.ll.bc

@@ -0,0 +1,59 @@
+; RUN: llvm-dis < %S/Inputs/coro-retcon-frame-auto-upgrade-test.ll.bc 2>&1 | FileCheck %s 
+
+; ModuleID = '../llvm-project/llvm/test/Transforms/Coroutines/coro-retcon-frame-auto-upgrade.bc'
+; CHECK: source_filename = "../llvm-project/llvm/test/Transforms/Coroutines/coro-retcon-frame-auto-upgrade.ll"
+; CHECK: target datalayout = "p:64:64:64"
+
+; CHECK: declare void @prototype_f(ptr, i1)
+
+; CHECK: declare noalias ptr @allocate(i32)
+
+; CHECK: declare void @deallocate(ptr)
+
+; CHECK: declare void @init(ptr)
+
+; CHECK: declare void @use(ptr)
+
+; CHECK: declare void @use_addr_val(i64, ptr)
+
+; Function Attrs: presplitcoroutine
+; CHECK: define { ptr, ptr } @f(ptr %buffer) #0 {
+; CHECK: entry:
+; CHECK:   %tmp = alloca { i64, i64 }, align 8
+; CHECK:   %proj.1 = getelementptr inbounds { i64, i64 }, ptr %tmp, i64 0, i32 0
+; CHECK:   %proj.2 = getelementptr inbounds { i64, i64 }, ptr %tmp, i64 0, i32 1
+; CHECK:   store i64 0, ptr %proj.1, align 8
+; CHECK:   store i64 0, ptr %proj.2, align 8
+; CHECK:   %escape_addr = ptrtoint ptr %tmp to i64
+; CHECK:   %id = call token (i32, i32, ptr, ptr, ptr, ptr, ...) @llvm.coro.id.retcon.once(i32 32, i32 8, ptr %buffer, ptr @prototype_f, ptr @allocate, ptr @deallocate)
+; CHECK:   %hdl = call ptr @llvm.coro.begin(token %id, ptr null)
+; CHECK:   %proj.2.2 = getelementptr inbounds { i64, i64 }, ptr %tmp, i64 0, i32 1
+; CHECK:   call void @init(ptr %proj.1)
+; CHECK:   call void @init(ptr %proj.2.2)
+; CHECK:   call void @use_addr_val(i64 %escape_addr, ptr %tmp)
+; CHECK:   %abort = call i1 (...) @llvm.coro.suspend.retcon.i1(ptr %tmp)
+; CHECK:   br i1 %abort, label %end, label %resume
+
+; CHECK: resume:                                           ; preds = %entry
+; CHECK:   call void @use(ptr %tmp)
+; CHECK:   br label %end
+
+; CHECK: end:                                              ; preds = %resume, %entry
+; CHECK:   %0 = call i1 @llvm.coro.end(ptr %hdl, i1 false, token none)
+; CHECK:   unreachable
+; CHECK: }
+
+; Function Attrs: nounwind
+; CHECK: declare ptr @llvm.coro.begin(token, ptr writeonly) #1
+
+; Function Attrs: nounwind
+; CHECK: declare i1 @llvm.coro.suspend.retcon.i1(...) #1
+
+; Function Attrs: nounwind
+; CHECK: declare i1 @llvm.coro.end(ptr, i1, token) #1
+
+; Function Attrs: nounwind
+; CHECK: declare token @llvm.coro.id.retcon.once(i32, i32, ptr, ptr, ptr, ptr, ...) #1
+
+; CHECK: attributes #0 = { presplitcoroutine }
+; CHECK: attributes #1 = { nounwind }