[clang] [X86][AVX10] Disable m[no-]avx10.1 and switch m[no-]avx10.2 to alias of 512 bit options (PR #124511)

[Phoebe Wang via cfe-commits]

phoebewang wrote:

> > We also change -mno-avx10.[1,2]-512 to alias of 256 bit options to disable both 256 and 512 instructions.
> 
> Why this?

Because we expect m[no-]avx10.2 cover both 256 and 512 bit instructions.

https://github.com/llvm/llvm-project/pull/124511