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.

Source/Core/Core/PowerPC/PPCAnalyst.h

@@ -69,6 +69,11 @@ struct BlockRegStats
 			   std::min(firstRead[reg], firstWrite[reg]);
 	}
 
+	bool IsUsed(int reg)
+	{
+		return (numReads[reg] + numWrites[reg]) > 0;
+	}
+
 	inline void SetInputRegister(int reg, short opindex)
 	{
 		if (firstRead[reg] == -1)