[mypyc] feat: unroll certain for loops with known params #19518
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This PR, when finished, will unroll any
forloops that iterate across a set of values which are known at compile timeThis allows us to entirely bypass any iteration overhead and keep more things in C-space
It also does the same when iterating across the values of any mypyc-defined tuple types, whether the values are known at compile time or not
The generated C code will be longer but more readable with less branching and no iterator overhead, will offer the C compiler many more opportunities for optimization