PPTC & Pool Enhancements. (#1968)

* PPTC & Pool Enhancements.

* Avoid buffer allocations in CodeGenContext.GetCode(). Avoid stream allocations in PTC.PtcInfo.

Refactoring/nits.

* Use XXHash128, for Ptc.Load & Ptc.Save, x10 faster than Md5.

* Why not a nice Span.

* Added a simple PtcFormatter library for deserialization/serialization, which does not require reflection, in use at PtcJumpTable and PtcProfiler; improves maintainability and simplicity/readability of affected code.

* Nits.

* Revert #1987.

* Revert "Revert #1987."

This reverts commit 998be765cf.

ARMeilleure/Common/BitMapPool.cs

@@ -4,15 +4,29 @@
     {
         public static BitMap Allocate(int initialCapacity)
         {
-            BitMap result = ThreadStaticPool<BitMap>.Instance.Allocate();
-            result.Reset(initialCapacity);
-
-            return result;
+            return BitMap().Reset(initialCapacity);
         }
 
-        public static void Release()
+        #region "ThreadStaticPool"
+        public static void PrepareBitMapPool(int groupId = 0)
         {
-            ThreadStaticPool<BitMap>.Instance.Clear();
+            ThreadStaticPool<BitMap>.PreparePool(groupId, ChunkSizeLimit.Small);
         }
+
+        private static BitMap BitMap()
+        {
+            return ThreadStaticPool<BitMap>.Instance.Allocate();
+        }
+
+        public static void ResetBitMapPool(int groupId = 0)
+        {
+            ThreadStaticPool<BitMap>.ResetPool(groupId);
+        }
+
+        public static void DisposeBitMapPools()
+        {
+            ThreadStaticPool<BitMap>.DisposePools();
+        }
+        #endregion
     }
 }