Fix C4163 warning in VS2026 when target is ARM64EC#162
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The MSVC intrinsic
_umul128is not available when the target architecture is ARM64EC which results in the following warning:ankerl\stl.h(80,23): warning C4163: '_umul128': not available as an intrinsic function.The guard around the
_umul128intrinsic directive instl.hneeds an explicit check for_M_ARM64ECas_M_X64is defined for both x64 and AMR64EC.