Several issues:
1. Several terminal instructions did not stop at the end of a single-step block
2. x64 backend for the A32 frontend sometimes polluted upper_location_descriptor with the single-stepping flag
We also introduce the enable_optimizations parameter to the A32 frontend.
Instead of looking up the page table like:
table[addr >> 12][addr & 0xFFF]
We can use a global offset on the table to query the memory like:
table[addr >> 12][addr]
This saves two instructions on *every* memory access within the recompiler.
Original change by degasus in A64 emitter
