e1328fd9ad
Clarify the semantics of `getAuthenticatedReg` and remove a redundant `isAuthenticationOfReg` method, as combined auth+something instructions (such as `retaa` on AArch64) should be handled carefully, especially when searching for authentication oracles: usually, such instructions cannot be authentication oracles and only some of them actually write an authenticated pointer to a register (such as "ldra x0, [x1]!"). Use `std::optional<MCPhysReg>` returned type instead of plain MCPhysReg and returning `getNoRegister()` as a "not applicable" indication. Document a few existing methods, add information about preconditions.
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