Added unit tests

Author: nickolas-pohilets

test/SILOptimizer/stack_promotion_isolated_deinit.swift

@@ -0,0 +1,71 @@
+// RUN: %target-swift-frontend -parse-as-library -O -module-name=test %s -emit-sil -enable-experimental-feature IsolatedDeinit | %FileCheck %s
+// REQUIRES: swift_in_compiler
+
+@globalActor actor AnotherActor: GlobalActor {
+  static let shared = AnotherActor()
+}
+
+final class Inner {}
+
+final class IsolatedDeinit {
+    var inner: Inner?
+    @AnotherActor deinit {}
+}
+
+final class Container {
+    var ref: IsolatedDeinit?
+}
+
+// CHECK-LABEL: sil [noinline] {{.*}}@$s4test0A16ContainerOutsideyyF : $@convention(thin) () -> () {
+// CHECK: [[C:%.*]] = alloc_ref [bare] [stack] $Container
+// CHECK: [[ID:%.*]] = alloc_ref $IsolatedDeinit
+// CHECK: dealloc_stack_ref [[C]] : $Container
+// CHECK: return
+@inline(never)
+public func testContainerOutside() {
+    // container can be promoted
+    let container = Container()
+    let obj = IsolatedDeinit()
+    container.ref = obj
+}
+
+// CHECK-LABEL: sil [noinline] @$s4test0A15ContainerInsideyyF : $@convention(thin) () -> () {
+// CHECK: [[D:%.*]] = alloc_ref $IsolatedDeinit
+// CHECK: [[C:%.*]] = alloc_ref [bare] [stack] $Container
+// CHECK: dealloc_stack_ref [[C]] : $Container
+// CHECK: return
+@inline(never)
+public func testContainerInside() {
+    let obj = IsolatedDeinit()
+    // container can be promoted
+    let container = Container()
+    container.ref = obj
+}
+
+// CHECK-LABEL: sil [noinline] @$s4test0A12InnerOutsideyyF : $@convention(thin) () -> () {
+// CHECK: [[I:%.*]] = alloc_ref $Inner
+// CHECK: [[D:%.*]] = alloc_ref $IsolatedDeinit
+// CHECK: [[DI:%.*]] = end_init_let_ref [[D]] : $IsolatedDeinit
+// CHECK: strong_release [[DI]] : $IsolatedDeinit
+// CHECK: return
+@inline(never)
+public func testInnerOutside() {
+    // inner cannot be promoted, because it escapes to isolated deinit
+    let inner = Inner()
+    let obj = IsolatedDeinit()
+    obj.inner = inner
+}
+
+// CHECK-LABEL: sil [noinline] @$s4test0A11InnerInsideyyF : $@convention(thin) () -> () {
+// CHECK: [[D:%.*]] = alloc_ref $IsolatedDeinit
+// CHECK: [[DI:%.*]] = end_init_let_ref [[D]] : $IsolatedDeinit
+// CHECK: [[I:%.*]] = alloc_ref $Inner
+// CHECK: strong_release [[DI]] : $IsolatedDeinit
+// CHECK: return
+@inline(never)
+public func testInnerInside() {
+    let obj = IsolatedDeinit()
+    // inner cannot be promoted, because it escapes to isolated deinit
+    let inner = Inner()
+    obj.inner = inner
+}