ARM exclusive monitor and multicore fixes (#589)

* Implement ARM exclusive load/store with compare exchange insts, and enable multicore by default

* Fix comment typo

* Support Linux and OSX on MemoryAlloc and CompareExchange128, some cleanup

* Use intel syntax on assembly code

* Adjust identation

* Add CPUID check and fix exclusive reservation granule size

* Update schema multicore scheduling default value

* Make the cpu id check code lower case aswell

ChocolArm64/Memory/MemoryProtection.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace ChocolArm64.Memory
+{
+    [Flags]
+    public enum MemoryProtection
+    {
+        None    = 0,
+        Read    = 1 << 0,
+        Write   = 1 << 1,
+        Execute = 1 << 2,
+
+        ReadAndWrite   = Read | Write,
+        ReadAndExecute = Read | Execute
+    }
+}