Compilation failure with Clang-cl: iterators.h nextBit

[bmanga]

Vc version / revision	Operating System	Compiler & Version	Compiler Flags	Assembler & Version	CPU

  1.4.2                |        Windows          |     Clang 12               |                |                     |

I hit line 168 of common/iterators.h:

        void nextBit()
        {
#ifdef Vc_GNU_ASM
            bit = __builtin_ctzl(mask);
#elif defined(Vc_MSVC)
            _BitScanForward(&bit, mask);
#else
#error "Not implemented yet. Please contact [email protected]"
#endif
        }

Apparently clang on Windows is neither Vc_GNU_ASM nor Vc_MSVC. Something like the following works for me:

        void nextBit()
        {
#ifdef Vc_MSVC
            _BitScanForward(&bit, mask);
#else
            bit = __builtin_ctzl(mask);
#endif
        }