[APINotes] Add tests for using-decl in a namespace

rdar://113403829

Author: egorzhdan

clang/test/APINotes/Inputs/Headers/Namespaces.apinotes

@@ -11,6 +11,8 @@ Namespaces:
     Typedefs:
       - Name: my_typedef
         SwiftName: SwiftTypedef
+      - Name: my_using_decl
+        SwiftName: SwiftUsingDecl
     Globals:
       - Name: varInNamespace
         SwiftName: swiftVarInNamespace

clang/test/APINotes/Inputs/Headers/Namespaces.h

@@ -30,4 +30,5 @@ namespace Nested1 { namespace Namespace1 {} }
 
 namespace Namespace1 {
 typedef int my_typedef;
+using my_using_decl = int;
 }

clang/test/APINotes/namespaces.cpp

@@ -1,6 +1,7 @@
 // RUN: rm -rf %t && mkdir -p %t
 // RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/CxxInterop -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -x objective-c++
 // RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/CxxInterop -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -ast-dump -ast-dump-filter Namespace1::my_typedef -x objective-c++ | FileCheck -check-prefix=CHECK-TYPEDEF-IN-NAMESPACE %s
+// RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/CxxInterop -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -ast-dump -ast-dump-filter Namespace1::my_using_decl -x objective-c++ | FileCheck -check-prefix=CHECK-USING-DECL-IN-NAMESPACE %s
 // RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/CxxInterop -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -ast-dump -ast-dump-filter Namespace1::varInNamespace -x objective-c++ | FileCheck -check-prefix=CHECK-GLOBAL-IN-NAMESPACE %s
 // RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/CxxInterop -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -ast-dump -ast-dump-filter Namespace1::funcInNamespace -x objective-c++ | FileCheck -check-prefix=CHECK-FUNC-IN-NAMESPACE %s
 // RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/CxxInterop -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -ast-dump -ast-dump-filter Namespace1::char_box -x objective-c++ | FileCheck -check-prefix=CHECK-STRUCT-IN-NAMESPACE %s
@@ -16,6 +17,10 @@
 // CHECK-TYPEDEF-IN-NAMESPACE-NEXT: TypedefDecl {{.+}} imported in Namespaces my_typedef 'int'
 // CHECK-TYPEDEF-IN-NAMESPACE: SwiftNameAttr {{.+}} <<invalid sloc>> "SwiftTypedef"
 
+// CHECK-USING-DECL-IN-NAMESPACE: Dumping Namespace1::my_using_decl:
+// CHECK-USING-DECL-IN-NAMESPACE-NEXT: TypeAliasDecl {{.+}} imported in Namespaces my_using_decl 'int'
+// CHECK-USING-DECL-IN-NAMESPACE: SwiftNameAttr {{.+}} <<invalid sloc>> "SwiftUsingDecl"
+
 // CHECK-GLOBAL-IN-NAMESPACE: Dumping Namespace1::varInNamespace:
 // CHECK-GLOBAL-IN-NAMESPACE-NEXT: VarDecl {{.+}} imported in Namespaces varInNamespace 'int' static cinit
 // CHECK-GLOBAL-IN-NAMESPACE-NEXT: IntegerLiteral {{.+}} 'int' 1