Use autoconf for recognizing __builtin_unreachable() - #12266
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Older versions of GCC don't support __has_builtin(), but do support __builtin_unreachable().
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Older versions of GCC don't support __has_builtin(), but do support __builtin_unreachable().
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Older versions of GCC don't support __has_builtin(), but do support __builtin_unreachable().