Re: [PATCH v3 0/7] MR6752: include: More fixes to build libc++.

[Jacek Caban (＠jacek)]

Jacek Caban (@jacek) commented about include/winnt.h:
> #ifdef __x86_64__
>
> +#if defined(_MSC_VER) && !defined(__arm64ec__) && (!defined(__clang__) || __has_builtin(__shiftright128))
> +#define ShiftRight128 __shiftright128
> +DWORD64 __shiftright128(DWORD64,DWORD64,BYTE);
> +#pragma intrinsic(__shiftright128)
> +#elif !defined(__i386__)

It's in `__x86_64__` `#ifdef` now, so this is a no-op check. From what I can see, `ShiftRight128` should be defined on ARM64 too, through.