pass exception pc in x2 reg for both slow/fast paths
infer the op type and size from the armv8 op encoding
rewrite doesn't need access to the block anymore
add support for some imm args
native implementation of negc and xtrct for x64 and arm64
rec-arm64: pass exception pc in w27 instead of sh4 context
inline mmu_intruction_translation() and clean up
generates direct vmem read & write accesses
trap sigsegv and rewrite using slow path
add w29 to allocatable registers
get rid of literals and use pc-rel branching
minor optimizations and cleanup