goalc: Get CodeTester tests passing on Arm64 (only targetting macOS atm) (#3290)

This PR does the following:
- Designs a mechanism by which arm64 instructions can be encoded and
emitted
- Dispatch our higher-level instruction emitting calls to either x86 or
arm64 instructions depending on what the compiler is set to (defaults to
x86)
- Bare minimum scaffolding to get the arm64 instructions successfully
executing atleast on apple silicon
- Implement enough instructions to get the codetester test suite passing
on arm

game/runtime.cpp

@@ -27,7 +27,6 @@
 #include "common/global_profiler/GlobalProfiler.h"
 #include "common/goal_constants.h"
 #include "common/log/log.h"
-#include "common/util/FileUtil.h"
 #include "common/versions/versions.h"
 
 #include "game/external/discord.h"
@@ -55,9 +54,6 @@
 #include "game/kernel/jak3/klisten.h"
 #include "game/kernel/jak3/kscheme.h"
 #include "game/kernel/jakx/kboot.h"
-#include "game/kernel/jakx/kdgo.h"
-#include "game/kernel/jakx/klisten.h"
-#include "game/kernel/jakx/kscheme.h"
 #include "game/overlord/common/fake_iso.h"
 #include "game/overlord/common/iso.h"
 #include "game/overlord/common/sbank.h"
@@ -70,7 +66,6 @@
 #include "game/overlord/jak1/overlord.h"
 #include "game/overlord/jak1/ramdisk.h"
 #include "game/overlord/jak1/srpc.h"
-#include "game/overlord/jak1/ssound.h"
 #include "game/overlord/jak1/stream.h"
 #include "game/overlord/jak2/dma.h"
 #include "game/overlord/jak2/iso_cd.h"
@@ -82,7 +77,6 @@
 #include "game/overlord/jak2/stream.h"
 #include "game/overlord/jak2/streamlist.h"
 #include "game/overlord/jak2/vag.h"
-#include "game/overlord/jak3/init.h"
 #include "game/overlord/jak3/overlord.h"
 #include "game/system/Deci2Server.h"
 #include "game/system/iop_thread.h"
@@ -155,6 +149,13 @@ void deci2_runner(SystemThreadInterface& iface) {
 void ee_runner(SystemThreadInterface& iface) {
   prof().root_event();
   // Allocate Main RAM. Must have execute enabled.
+  // TODO Apple Silicon - You cannot make a page be RWX,
+  // or more specifically it can't be both writable and executable at the same time
+  //
+  // https://github.com/zherczeg/sljit/issues/99
+  //
+  // The solution to this is to flip-flop between permissions, or perhaps have two threads
+  // one that has writing permission, and another with executable permission
   if (EE_MEM_LOW_MAP) {
     g_ee_main_mem =
         (u8*)mmap((void*)0x10000000, EE_MAIN_MEM_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE,