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Reland #82363 after fixing build failure https://lab.llvm.org/buildbot/#/builders/5/builds/41428. Memory sanitizer detects usage of `RawData` union member which is not filled directly. Instead, the code relies on filling `Data` union member, which is a struct consisting of signing schema parameters. According to https://en.cppreference.com/w/cpp/language/union, this is UB: "It is undefined behavior to read from the member of the union that wasn't most recently written". Instead of relying on compiler allowing us to do dirty things, do not use union and only store `RawData`. Particular ptrauth parameters are obtained on demand via bit operations. Original PR description below. Emit `__ptrauth`-qualified types as `DIDerivedType` metadata nodes in IR with tag `DW_TAG_LLVM_ptrauth_type`, baseType referring to the type which has the qualifier applied, and the following parameters representing the signing schema: - `ptrAuthKey` (integer) - `ptrAuthIsAddressDiscriminated` (boolean) - `ptrAuthExtraDiscriminator` (integer) - `ptrAuthIsaPointer` (boolean) - `ptrAuthAuthenticatesNullValues` (boolean) Co-authored-by: Ahmed Bougacha <ahmed@bougacha.org>