x64: more C stuff
x64: bla compile c
x64: fix more c_compiler
update TODO
begin arm64 support
arm64: tweak instr arg order
arm64: few more instrs
arm64: tweak r32
arm64: ldr
arm64: b
arm64: fix memref offsets
arm64: stp
arm64: fix stp
arm64: adrp
arm64: add instrs
arm64: more insns
arm64: add and/orr/eor/ands variants
arm64: fix opcodes, add cmp
arm64: fix ret
arm64: extended add