It now supports variable-sized data payloads and memory range freeing. It's a little faster, too.

This saves two register pushes / pops.

WritePC is now needed far less, only for instructions that end the block. Unfortunately, WritePC still needs to update `PowerPCState::npc` to support the false path of conditional branch instructions. Both drawbacks should be smoothed over by optimized cached instructions in the future.

This was a bigger performance boost than I expected.

…tePC

I tried making the new templated Interpret callback test only the relevant exceptions (EXCEPTION_DSI, EXCEPTION_PROGRAM, or both), but didn't find a significant performance boost in it. As I am learning, the biggest bottleneck is the number of callbacks emitted, not usually the actual contents of them.

Accessible from DolphinQt and Android.

I added a new `get_stats` member function to the upstream for use in the JIT Widget Refresh.

Fulfilling a certain six-year-old todo, and revamping LogGeneratedX86 as a bonus.