[clang] [llvm] [X86][AVX10] Remove EVEX512 and AVX10-256 implementations (PR #157034)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

Do we have any test coverage of the error messages if people use the old args and does it explain how they can fix it? Not sure how important it is given its still early days for avx10 but I imagine someone has already started using it......

https://github.com/llvm/llvm-project/pull/157034