[Draft] Disassembly: Merge li a0 + syscall

[wheremyfoodat]

Detects the pattern

li $a0, syscallNumber
syscall

And merges those 2 instructions like so:

This is a draft as some limitations apply:

• This feature can't be turned on/off independently from the "Combined pseudo-instructions" option, as it would require a fair bit of rework on the disassembler
• This feature doesn't work if the li pseudo-instruction uses a 2-instruction form. Realistically, this doesn't matter as it's never the case in most PS1 software.

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