Handle Intel's emerald rapids and do some formatting in the cpuid_x86 file

[lindsayad]

The instruction set for emerald rapids is the same as sapphire rapids so I select the same arch's for the emerald rapids branches as for the sapphire rapids branches, e.g.

        case 15: // Emerald Rapids
          if (support_amx_bf16()) return CORE_SAPPHIRERAPIDS;
          if (support_avx512_bf16()) return CORE_COOPERLAKE;
          if (support_avx512()) return CORE_SKYLAKEX;
          if (support_avx2()) return CORE_HASWELL;
          if (support_avx()) return CORE_SANDYBRIDGE;
          else return CORE_NEHALEM;

I was also having a very hard time following the code with the different indentation levels so I've clang-formatted the file. I can understand if this is undesirable so I will revert if asked, but in my opinion it significantly improves the file's readability.