[clang] [CIR] Upstream test to lower string from incubator (PR #185956)

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor commented:

This test case should be added to clang/test/CIR/CodeGen/string-literals.cpp. In general, the "Lowering" tests in the incubator don't need to be upstreamed, but if they are testing something that isn't otherwise covered in CodeGen tests (as seems to be the case here), the test should be moved there.

https://github.com/llvm/llvm-project/pull/185956