Slightly faster odin implementation

[BigBoyBarney]

This is a slightly faster Odin implementation, around 3% faster on my machine.

[jabbalaci]

Which change caused the speedup in your opinion?

[BigBoyBarney]

It's certainly moving cache: [10]int into global memory, as opposed to the stack.

- main :: proc()
- {
-     // fill cache
-     cache: [10]int
+ cache: [10]int
+ main :: proc() {

Theoretically making the procedure contextless should have yielded some performance increase too, since it would mean that 1 less pointer is passed to the procedure. However, it's likely optimised out here because it's so simple and doesn't make a difference (here).

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Edit: I checked the assembly and the pointer is passed in the non-contextless case, but it makes virtually no difference in terms of speed on my machine. Maybe because it's just 1 instruction? Still, most maths functions in Odin's core:math are contextless, so it's good practice to do anyway, since we don't need the context.