Clear JIT cache on exit (#1518)

* Initial cache memory allocator implementation

* Get rid of CallFlag

* Perform cache cleanup on exit

* Basic cache invalidation

* Thats not how conditionals works in C# it seems

* Set PTC version to PR number

* Address PR feedback

* Update InstEmitFlowHelper.cs

* Flag clear on address is no longer needed

* Do not include exit block in function size calculation

* Dispose jump table

* For future use

* InternalVersion = 1519 (force retest).

Co-authored-by: LDj3SNuD <35856442+LDj3SNuD@users.noreply.github.com>

ARMeilleure/Translation/Cache/JumpTableEntryAllocator.cs

@@ -0,0 +1,72 @@
+using ARMeilleure.Common;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace ARMeilleure.Translation.Cache
+{
+    class JumpTableEntryAllocator
+    {
+        private readonly BitMap _bitmap;
+        private int _freeHint;
+
+        public JumpTableEntryAllocator()
+        {
+            _bitmap = new BitMap();
+        }
+
+        public bool EntryIsValid(int entryIndex)
+        {
+            lock (_bitmap)
+            {
+                return _bitmap.IsSet(entryIndex);
+            }
+        }
+
+        public void SetEntry(int entryIndex)
+        {
+            lock (_bitmap)
+            {
+                _bitmap.Set(entryIndex);
+            }
+        }
+
+        public int AllocateEntry()
+        {
+            lock (_bitmap)
+            {
+                int entryIndex;
+
+                if (!_bitmap.IsSet(_freeHint))
+                {
+                    entryIndex = _freeHint;
+                }
+                else
+                {
+                    entryIndex = _bitmap.FindFirstUnset();
+                }
+
+                _freeHint = entryIndex + 1;
+
+                bool wasSet = _bitmap.Set(entryIndex);
+                Debug.Assert(wasSet);
+
+                return entryIndex;
+            }
+        }
+
+        public void FreeEntry(int entryIndex)
+        {
+            lock (_bitmap)
+            {
+                _bitmap.Clear(entryIndex);
+
+                _freeHint = entryIndex;
+            }
+        }
+
+        public IEnumerable<int> GetEntries()
+        {
+            return _bitmap;
+        }
+    }
+}