Merge pull request #61764 from compnerd/witness

tests: enable a couple of C++ value witness table tests

Author: compnerd

test/Interop/Cxx/value-witness-table/custom-destructors-virtual-irgen.swift

@@ -3,9 +3,6 @@
 // FIXME: Once we can link with libc++ we can start using RTTI.
 //
 // RUN: %target-swift-frontend -enable-experimental-cxx-interop -I %S/Inputs %s -emit-ir -Xcc -fno-rtti | %FileCheck %s
-//
-// Windows doesn't support -fno-rtti.
-// UNSUPPORTED: OS=windows-msvc
 
 import CustomDestructor
 

test/Interop/Cxx/value-witness-table/custom-destructors-virtual.swift

@@ -6,8 +6,7 @@
 // RUN: %target-run-simple-swift(-I %S/Inputs -Xfrontend -enable-experimental-cxx-interop -Xcc -fno-rtti -O)
 //
 // REQUIRES: executable_test
-// Windows doesn't support -fno-rtti.
-// UNSUPPORTED: OS=windows-msvc
+// XFAIL: OS=windows-msvc
 
 import CustomDestructor
 import StdlibUnittest