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CPUID is part of x86_64 ISA to query CPU features. In order to determine AVX512F ISA extension, EAX and ECX needs to be set to 7 and 0 respectively before invoking `cpuid` instruction. This commit also removes inline assembly for __cpuid in favor of using compiler provided intrinsic functions. Both GCC and clang provides __cpuid like function via __cpuid_count intrinsic. This commit also creates a portable wrapper over compiler intrinsic functions, __cpuid and __cpuidex. `cpuid' provides base level ISA query and `cpuidex` provides extra extension information like AVX512F. These wrappers lean towards MSVC like API. References: CPUID Docs: https://en.wikipedia.org/wiki/CPUID GCC's ``docs" on __cpuid_count: https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/i386/cpuid.h Clang's docs on __cpuid_count: https://clang.llvm.org/doxygen/cpuid_8h.html MSVC's docs on __cpuid and __cpuidex: https://learn.microsoft.com/en-us/cpp/intrinsics/cpuid-cpuidex
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