Simple summation 8x slower than in Julia

@oscardssmith, no doubt as a user I would like to see exactly how the compiler implements intrinsics and contribute to its implementation. I think Fortran intrinsic math functions should be written in Fortran and the Fortran compiler(s) should be able to optimize Fortran code so well, that you can write them in Fortran. I suggested something along those lines in: Fortran runtime math library, but it wasn’t received well. I still think it’s a good idea and the way to go for LFortran, and it is still my goal.

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