ARM TableGen Update (#208380)
- This PR replaces existing ARM builtin functions with TableGen.
- The `.td` file returns identical header names & type signatures as the
`.def` generated headers and types
- The change has been tested via the following:
- `check-clang-tablegen`
- `check-clang-sema`
- `check-clang-codegen-arm`
- `check-clang-codegen`
- `clang-check`
- `check-clang`
- None of the above returned errors or warnings
- The translation is mostly done via a translation script written in
Python
- [Link to translation
script](https://github.com/patricklapgar/python_scripts/blob/main/llvm/clang/arm_tablegen_mig.py)
- [Link to translation script test
suite](https://github.com/patricklapgar/python_scripts/blob/main/llvm/clang/test_arm_tablegen_mig.py)
- Disclaimer: Both the translation script and its test suite were made
w/ assistance from AI (IBM Bob)
