Upgrade CppInterOp to support llvm 20 (non-wasm) #222

Job	Run time
osx15-arm-clang-clang-repl-20	21s
osx15-arm-clang-clang-repl-19	7s
osx15-arm-clang-clang-repl-18	2m 20s
osx15-arm-clang-clang-repl-17	42s
osx15-arm-clang-clang-repl-16	9s
osx15-arm-clang-clang13-cling	43s
osx15-arm-clang-clang-repl-20	3m 7s
osx15-arm-clang-clang-repl-19-cppyy	4m 26s
osx15-arm-clang-clang-repl-18-cppyy	3m 38s
osx15-arm-clang-clang-repl-17-cppyy	4m 2s
osx15-arm-clang-clang-repl-16	2m 24s
osx15-arm-clang-clang13-cling-cppyy	3m 42s
	25m 41s

Provide feedback