Depends on #84384 and #90329 This adds support for `DW_TAG_LLVM_ptrauth_type` entries corresponding to explicitly signed types (e.g. free function pointers) in lldb user expressions. Applies PR https://github.com/apple/llvm-project/pull/8239 from Apple's downstream and also adds tests and related code. --------- Co-authored-by: Jonas Devlieghere <jonas@devlieghere.com>