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attributes: Don't try to use _BitScanReverse64 on MSVC/ARM

Despite what MSDN says, this intrinsic doesn't exist for ARM,
only for ARM64.

--- a/include/common/attributes.h

+++ b/include/common/attributes.h

@@ -87,7 +87,7 @@

     return (31 - leading_zero);

 }

-#ifndef _M_IX86

+#ifdef _WIN64

 static inline int clzll(const unsigned long long mask) {

     unsigned long leading_zero = 0;

     _BitScanReverse64(&leading_zero, mask);