[cxx-interop] Adjust another IRGen test for rebranch

This fixes `Interop/Cxx/class/method/methods-this-and-indirect-return-irgen-itanium.swift` by adjusting the expected function signature.

On rebranch, the actual signature is:
```
define linkonce_odr void @_ZN10HasMethods28nonConstPassThroughAsWrapperEi(ptr dead_on_unwind noalias writable sret(%struct.NonTrivialInWrapper) align 4 %agg.result, ptr noundef nonnull align 1 dereferenceable(1) %this, i32 noundef %a)
```

rdar://127263407

Author: egorzhdan

test/Interop/Cxx/class/method/methods-this-and-indirect-return-irgen-itanium.swift

@@ -14,4 +14,4 @@ public func use() -> CInt {
 // CHECK: %[[result:.*]] = alloca %TSo19NonTrivialInWrapperV
 // CHECK: call void @_ZN10HasMethods28nonConstPassThroughAsWrapperEi(ptr noalias sret(%TSo19NonTrivialInWrapperV) %[[result]], ptr %[[instance]], i32 42)
 
-// CHECK: define {{.*}} void @_ZN10HasMethods28nonConstPassThroughAsWrapperEi(ptr noalias sret(%struct.NonTrivialInWrapper) {{.*}} %{{.*}}, ptr {{.*}} %{{.*}}, i32 noundef %{{.*}})
+// CHECK: define {{.*}} void @_ZN10HasMethods28nonConstPassThroughAsWrapperEi(ptr {{.*}} sret(%struct.NonTrivialInWrapper) {{.*}} %{{.*}}, ptr {{.*}} %{{.*}}, i32{{( noundef)?}} %{{.*}})