Fix clang-cl.exe compatibility by using the correct cpuid intrinsics

[charlescao460]

clang-cl.exe is designed to be the drop-in replacement of MSVC's cl.exe. Therefore, _MSC_VER preprocessor symbol is also defined by clang-cl.exe.

However, some LLVM Clang's built-in functions (Intrinsics) are not compatible with MSVC. For example, __cpuid() is defined as:

#if __i386__
#define __cpuid(__leaf, __eax, __ebx, __ecx, __edx) \
    __asm("cpuid" : "=a"(__eax), "=b" (__ebx), "=c"(__ecx), "=d"(__edx) \
                  : "0"(__leaf))

(Reference: https://clang.llvm.org/doxygen/cpuid_8h_source.html)

Therefore, we need to use __get_cpuid instead of __cpuid when using clang-cl.exe

[tencent-adm]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #4738 (f4a321f) into master (903ec7c) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4738      +/-   ##
==========================================
- Coverage   94.59%   94.57%   -0.02%     
==========================================
  Files         687      687              
  Lines      207674   206717     -957     
==========================================
- Hits       196440   195506     -934     
+ Misses      11234    11211      -23     

Impacted Files	Coverage Δ
src/cpu.cpp	58.60% <ø> (ø)

... and 4 files with indirect coverage changes

[nihui]

Thanks for your contribution !