cpuid instruction detection function oc_detect_cpuid_helper is buggy

In lib/cpu.c there is cpuid instruction detection function oc_detect_cpuid_helper used for MSVC. Currently it just overwrites values of arguments (two pointers _eax and _ebx) with contents of eax and ebx registers:

    mov [_eax],eax
    mov [_ebx],ebx

It should be replaced with following code:

    mov ecx,_eax
    mov [ecx],eax
    mov ecx,_ebx
    mov [ecx],ebx

For me this bug always prevents to use cpuid instruction (didn't return correct values of eax and ebx) - therefore no MMX optimizations.

I'm using Micorosft Visual C++ 2008 Express Edition SP1 compiler.