[cxx-interop] Fix a test for move-only types

rdar://128424443

Author: egorzhdan

test/Interop/Cxx/class/move-only/inherited-field-access-silgen.swift

@@ -1,8 +1,6 @@
 // RUN: %target-swift-emit-sil -I %S/Inputs -cxx-interoperability-mode=swift-6 %s -validate-tbd-against-ir=none | %FileCheck %s
 // RUN: %target-swift-emit-sil -I %S/Inputs -cxx-interoperability-mode=upcoming-swift %s -validate-tbd-against-ir=none | %FileCheck %s
 
-// REQUIRES: rdar128424443
-
 import MoveOnlyCxxValueType
 
 func testGetX() -> CInt {
@@ -19,10 +17,17 @@ func testSetX(_ x: CInt) {
 
 testSetX(2)
 
-// CHECK: sil shared [transparent] @$sSo024NonCopyableHolderDerivedD0V1xSo0aB0Vvlu : $@convention(method) (@in_guaranteed NonCopyableHolderDerivedDerived) -> UnsafePointer<NonCopyable>
-// CHECK: {{.*}}(%[[SELF_VAL:.*]] : $*NonCopyableHolderDerivedDerived):
+// Beware: this test exhibits a subtle difference between open source Clang and AppleClang:
+// AppleClang runs in an ABI compatibility mode with Clang <= 4, which uses a
+// different criteria to determine whether a C++ type can be passed in 
+// registers. This causes Swift to assume that NonCopyableHolderDerivedDerived
+// can be both loadable or address-only, depending on the compiler flavor used.
+// (rdar://128424443)
+
+// CHECK: sil shared [transparent] @$sSo024NonCopyableHolderDerivedD0V1xSo0aB0Vvlu : $@convention(method) (@{{(in_)?}}guaranteed NonCopyableHolderDerivedDerived) -> UnsafePointer<NonCopyable>
+// CHECK: {{.*}}(%[[SELF_VAL:.*]] : ${{(\*)?}}NonCopyableHolderDerivedDerived):
 // CHECK: function_ref @{{.*}}__synthesizedBaseCall___synthesizedBaseGetterAccessor{{.*}} : $@convention(cxx_method) (@in_guaranteed NonCopyableHolderDerivedDerived) -> UnsafePointer<NonCopyable>
-// CHECK-NEXT: apply %{{.*}}(%[[SELF_VAL]])
+// CHECK-NEXT: apply %{{.*}}
 
 // CHECK: sil shared [transparent] @$sSo024NonCopyableHolderDerivedD0V1xSo0aB0Vvau : $@convention(method) (@inout NonCopyableHolderDerivedDerived) -> UnsafeMutablePointer<NonCopyable>
 // CHECK: function_ref @{{.*}}__synthesizedBaseCall___synthesizedBaseSetterAccessor{{.*}} : $@convention(cxx_method) (@inout NonCopyableHolderDerivedDerived) -> UnsafeMutablePointer<NonCopyable>