[cxx-interop] Test import-as-member for inline functions

rdar://138930477

Author: egorzhdan

test/Interop/Cxx/namespace/Inputs/import-as-member.h

@@ -8,6 +8,7 @@ struct NestedStruct {
 
 int nestedStruct_method(MyNS::NestedStruct p) SWIFT_NAME("MyNS.NestedStruct.method(self:)") { return p.value; }
 int nestedStruct_methodConstRef(const MyNS::NestedStruct &p) SWIFT_NAME("MyNS.NestedStruct.methodConstRef(self:)") { return p.value + 1; }
+inline int nestedStruct_methodInline(MyNS::NestedStruct p) SWIFT_NAME("MyNS.NestedStruct.methodInline(self:)") { return p.value + 2; }
 
 namespace MyNS {
 namespace MyDeepNS {

test/Interop/Cxx/namespace/import-as-member-module-interface.swift

@@ -3,6 +3,7 @@
 // CHECK:      extension MyNS.NestedStruct {
 // CHECK-NEXT:   func method() -> Int32
 // CHECK-NEXT:   func methodConstRef() -> Int32
+// CHECK-NEXT:   func methodInline() -> Int32
 // CHECK-NEXT: }
 
 // CHECK:      extension MyNS.MyDeepNS.DeepNestedStruct {

test/Interop/Cxx/namespace/import-as-member.swift

@@ -11,6 +11,7 @@ NamespacesTestSuite.test("Struct in a namespace") {
   let s = MyNS.NestedStruct()
   expectEqual(123, s.method())
   expectEqual(124, s.methodConstRef())
+  expectEqual(125, s.methodInline())
 }
 
 NamespacesTestSuite.test("Struct in a deep namespace") {