Replicate __builtin_unreachable() on MSVC with __assume(false) #31
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This PR adds a minor change for MSVC: I could not find a definition of
__builtin_unreachable()on MSVC. Supposedly the equivalent for the Microsoft compiler is to use__assume(false). Tested with Visual Studio 2019 x64 using the Microsfot and the ClangCL compilers.