[AArch64-emitter] Initial work on a emitter for 64bit ARM.
I've tested a few instruction encodings and am expecting most to work as long as one stays away from VFP/SIMD.
This implements mostly instructions to bring up an initial JIT with integer support.
This can be improved to allow ease of use functions in the future, dealing with the raw imms/immr encodings is probably the worst thing ever.
Beginning of the AArch64 JIT branch.
This is the bare minimum required to run a few games on AArch64.
Was able to run starfield and Animal Crossing to the Nintendo logo.
QEmu emulation is literally the slowest thing in the world, it maxes out at around 12mhz on my Core i7-4930MX.
Add immediate support to the GPR cache.
Add AArch64 target to the backpatch header.
This fixes the issue of a million warnings spawning from this header.
Add a couple of asserts to the Arm64 JIT to make sure we can load everything.
Merge pull request #897 from Sonicadvance1/AArch64-jit

Initial AArch64 JIT