There were some checks removed previously in
bc196970b549782bffde5fdbfa450c565af11fc1.
However, all these SPIs are actually defined in macOS 12 and onward, not
macOSX 10.12 as the previous commit would suggest. As a result, if you
have access to these SPIs lldb will fail to compile correctly.
Instead of adding back the __builtin_availability checks, it seems
easier just to check the minimum deployment target with Availability
macros.
Differential Revision: https://reviews.llvm.org/D156838
6c2e324916