llvm-project

bc07dbe6 - [AArch64] Add error handling for unsupported bases in lowerConstantPtrAuth (#189474)

[AArch64] Add error handling for unsupported bases in lowerConstantPtrAuth (#189474) This is part of work being done in #188378 and #188638, split out from #188650. `lowerConstantPtrAuth` silently miscompiled `ConstantPtrAuth` constants with non-`GlobalValue` pointer bases — emitting `0@AUTH(da,0)` instead of erroring. Changes: - Handle `ConstantPointerNull` bases explicitly - Error via `reportFatalUsageError` on any remaining unresolved base (e.g. nested ptrauth) instead of silently miscompiling This PR was mostly developed with LLM assistance