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Factor some of the arithmetic operators out of TGuardedInt into AddAndCheckForOverflow et al functions in FPlatformMath so they can use the __builtin_*_overflow functions on clang that compile to much more efficient code than the portable C code does in most cases. #rb Fabian.Giesen, Johan.Torp [CL 26880341 by andrew scheidecker in ue5-main branch]