[SR-7263] Ensure caller alive after optimization

Author: ChristopherRogers

test/Interpreter/SDK/Inputs/objc_implicit_inner_pointer/objc_implicit_inner_pointer.h

@@ -0,0 +1,9 @@
+#import <Foundation/Foundation.h>
+
+@interface Foo: NSObject
+
+- (CFTypeRef _Nonnull)bar;
+- (CFTypeRef _Nullable)nullabar;
+
+@end
+

test/Interpreter/SDK/Inputs/objc_implicit_inner_pointer/objc_implicit_inner_pointer.m

@@ -0,0 +1,27 @@
+#import "objc_implicit_inner_pointer.h"
+
+@implementation Foo {
+  CFTypeRef _bar;
+}
+
+- (id)init {
+  _bar = (__bridge_retained CFTypeRef)[[NSNumber alloc] initWithInt:1234567891];
+  return self;
+}
+
+- (CFTypeRef)bar {
+  return _bar;
+}
+
+- (CFTypeRef)nullabar {
+  return _bar;
+}
+
+- (void)dealloc {
+  printf("%s", __FUNCTION__);
+
+  if (_bar)
+    CFRelease(_bar);
+}
+
+@end

test/Interpreter/SDK/objc_implicit_inner_pointer.swift

@@ -0,0 +1,21 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-clang -fobjc-arc %S/Inputs/objc_implicit_inner_pointer/objc_implicit_inner_pointer.m -c -o %t/objc_implicit_inner_pointer.o
+// RUN: %target-build-swift %s -import-objc-header %S/Inputs/objc_implicit_inner_pointer/objc_implicit_inner_pointer.h %t/objc_implicit_inner_pointer.o -o %t/main
+// RUN: %target-run %t/main | %FileCheck %s
+
+// REQUIRES: executable_test
+// REQUIRES: objc_interop
+
+do {
+  // The lifetime of Foo() currently gets extended using autorelease.
+  autoreleasepool {
+    let x = Foo().bar().takeUnretainedValue()
+    print(x) // CHECK: 1234567891
+  } // CHECK: -[Foo dealloc]
+
+  autoreleasepool {
+    let y = Foo().nullabar()!.takeUnretainedValue()
+    print(y) // CHECK: 1234567891
+  } // CHECK: -[Foo dealloc]
+}
+