[Feature Request] Do not recompile the SPU LLVM cache every boot

[dio-gh]

The title should be sufficiently clear. I'm well aware that the SPU cache version is bumped way more often than the PPU, and that changing certain settings may require a recompilation, but I'd argue that it still happens way less than me launching a given game several times in a row.

It's particularly problematic when testing games. I won't be updating RPCS3 left and right, I'll be relaunching the game a million times over. Recompiling thousands of modules every time, after every crash, for no reason, especially on my PC, is equivalent to torture.

[dio-gh]

@Nekotekina sorry for the direct mention, but it's only you who can call the shots on this anyways. Is this any feasible to be added?

[Nekotekina]

There were some obstacles (such as hard-coded values during compilation) which would render SPU LLVM cache useless. Need to carefully examine current state of things, I fixed some of them but can't say for sure that nothing remains.

[dio-gh]

Sounds moderately promising, thanks.

[dio-gh]

Has there been any further investigations in the topic since?

[MSuih]

This is a duplicate of #10452, I'll close this one as the other ticket includes all caches. And yes, there's been more thought put into this due to savestates.

[MSuih]

Oh, seems like I misread. This isn't about keeping the cache in memory, it's about storing the compiled data to disc along with the uncompiled data to speed up boot.