[cxx-interop] Fix a test on 32-bit platforms

rdar://102147255

Author: egorzhdan

test/Interop/SwiftToC/structs/small-structs-pass-return-direct-in-c.swift

@@ -4,9 +4,6 @@
 
 // RUN: %check-interop-c-header-in-clang(%t/structs.h -Wno-unused-function)
 
-// 32-bit disabled because of rdar://102147255
-// REQUIRES: PTRSIZE=64
-
 public struct StructOneI64 {
     let x: Int64
 }
@@ -22,15 +19,15 @@ public struct StructDoubleAndFloat {
 }
 
 // CHECK:      struct Structs_StructDoubleAndFloat {
-// CHECK-NEXT:   _Alignas(8) char _storage[12];
+// CHECK-NEXT:   _Alignas({{4|8}}) char _storage[12];
 // CHECK-NEXT: };
 
 // CHECK:      struct Structs_StructOneI64 {
-// CHECK-NEXT:   _Alignas(8) char _storage[8];
+// CHECK-NEXT:   _Alignas({{4|8}}) char _storage[8];
 // CHECK-NEXT: };
 
 // CHECK:      struct Structs_StructU16AndPointer {
-// CHECK-NEXT:   _Alignas(8) char _storage[16];
+// CHECK-NEXT:   _Alignas({{4|8}}) char _storage[16];
 // CHECK-NEXT: };
 
 public func returnNewStructOneI64() -> StructOneI64 { return StructOneI64(x: 42 ) }