Exclusivity test case for NS_NOESCAPE import.

<rdar://problem/36989789> [SR-6862]: "Unexpected partial_apply use".

Author: atrick

test/Inputs/clang-importer-sdk/usr/include/CoreFoundation.h

@@ -27,4 +27,6 @@ extern CFIndex CFIndex_test;
 #define CF_ENUM(_type, _name) enum _name : _type _name; enum _name : _type
 #define CF_OPTIONS(_type, _name) enum _name : _type _name; enum _name : _type
 
+#define CF_NOESCAPE __attribute__((noescape))
+
 #endif

test/Inputs/clang-importer-sdk/usr/include/Foundation.h

@@ -10,6 +10,7 @@
 
 #define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
 
+#define NS_NOESCAPE CF_NOESCAPE
 
 typedef struct objc_object { void *isa; } *id;
 

test/SILOptimizer/Inputs/optional_closure_bridging.h

@@ -0,0 +1,7 @@
+#include "Foundation.h"
+
+@interface SomeObjCInterface
+
++ (void)perform:(long * _Nonnull)val f:(void (NS_NOESCAPE ^ _Nullable)(void))block;
+
+@end

test/SILOptimizer/exclusivity_static_diagnostics_objc.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -enforce-exclusivity=checked -swift-version 4 -emit-sil -primary-file %s -o /dev/null -verify
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -import-objc-header %S/Inputs/optional_closure_bridging.h -enforce-exclusivity=checked -swift-version 4 -emit-sil -primary-file %s -o /dev/null -verify
 // REQUIRES: objc_interop
 
 import Foundation
@@ -9,3 +9,10 @@ class SomeClass {
     c()
   }
 }
+
+func testOptionalImport() {
+  var x = 0
+  // expected-warning@+2{{overlapping accesses to 'x', but modification requires exclusive access; consider copying to a local variable}}
+  // expected-note@+1{{conflicting access is here}}
+  SomeObjCInterface.perform(&x) { x += 1 }
+}