Auto Sync 18

[Rot127]

WIP

• [x] Fix InstrInfoEmitter conflicts.
  • [ ] Change MCInstDesc structs (those were changed to use less pointers).
• [x] Move rest of the new emitting code into printer functions.
• [x] Fix build errors
• [x] CI
  • [x] Add CI scripts from @kabeor again.
  • [x] Add CI job/script to test C++ table output to default LLVM C++ tables.
  • [x] Add CI job/script to check syntactical validity of emitted C tables.
• [x] Fix option registration of backends
• [x] Fix PPC gen with upstream LLVM
• [ ] Fix build error with release version in CI -.-
• [x] Fix generated C++ tables
• [ ] Copy to Capstone and open PR there.
  • [ ] ARM
  • [ ] PPC
  • [ ] AArch64
• [x] Rebase onto actual release away from rc3

After merge

• [ ] Reset auto-sync branch to auto-sync-18

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closes https://github.com/capstone-engine/llvm-capstone/issues/12