clang branch optimisation - #25
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clang does support
__builtin_expect(long exp, long c): https://llvm.org/docs/BranchWeightMetadata.html#builtin-expectbut clang does not define
__GNUC__when building with windows-msvc target triplett:x86_64-pc-windows-msvcbut clang does always define__clang__so it should check if__GNUC__OR__clang__is defined to define the likely and unlikely macros with__builtin_expectoptimisation.