[lldb][test] Fixed the test no_unique_address-with-bitfields (llvm#111902)

Fixed the error `unable to create target: 'No available targets are
compatible with triple "x86_64-apple-macosx10.4.0"'` running `clang
--target=x86_64-apple-macosx -c -gdwarf -o %t %s`.

Author: slydiman