Merge pull request #61524 from compnerd/import

test: add `CxxShim` import for test

Author: compnerd

test/Interop/Cxx/class/inheritance/fields.swift

@@ -5,6 +5,7 @@
 // Windows doesn't support -lc++ or -lstdc++.
 // UNSUPPORTED: OS=windows-msvc
 
+import CxxShim
 import StdlibUnittest
 import Fields