Force initializer of MemoryProvider instance

Author: mythz

src/ServiceStack.Memory/NetCoreMemory.cs

@@ -15,8 +15,9 @@ namespace ServiceStack.Memory
 {
     public sealed class NetCoreMemory : MemoryProvider
     {
-        private NetCoreMemory(){}
-        public static readonly NetCoreMemory Provider = new NetCoreMemory();  
+        private static NetCoreMemory provider;
+        public static NetCoreMemory Provider => provider ?? (provider = new NetCoreMemory());
+        private NetCoreMemory() { }
 
         public static void Configure() => Instance = Provider;
 

src/ServiceStack.Text/MemoryProvider.cs

@@ -75,7 +75,8 @@ public abstract Task<object> DeserializeAsync(Stream stream, Type type,
 
     public sealed class DefaultMemory : MemoryProvider
     {
-        public static readonly DefaultMemory Provider = new DefaultMemory();
+        private static DefaultMemory provider;
+        public static DefaultMemory Provider => provider ?? (provider = new DefaultMemory());
         private DefaultMemory() { }
 
         public static void Configure() => Instance = Provider;

src/ServiceStack.Text/NetCoreMemory.cs

@@ -15,9 +15,10 @@ namespace ServiceStack.Memory
 {
     public sealed class NetCoreMemory : MemoryProvider
     {
-        private NetCoreMemory(){}
-        public static readonly NetCoreMemory Provider = new NetCoreMemory();  
-        
+        private static NetCoreMemory provider;
+        public static NetCoreMemory Provider => provider ?? (provider = new NetCoreMemory());
+        private NetCoreMemory() { }
+    
         public static void Configure() => Instance = Provider;
 
         public override bool ParseBoolean(ReadOnlySpan<char> value) => bool.Parse(value);