Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

mcs/class/corlib/Mono/RuntimeStructs.cs

@@ -49,12 +49,6 @@ namespace Mono {
 			internal int len;
 		}
 
-		// handle.h HandleStackMark
-		struct HandleStackMark {
-			int size, interior_size;
-			IntPtr chunk;
-		}
-
 		// mono-error.h MonoError
 		struct MonoError {
 			ushort error_code;
@@ -80,4 +74,47 @@ namespace Mono {
 		internal ushort major, minor, build, revision;
 		internal ushort arch;
 	}
+
+	// Used to implement generic sharing
+	// See mini-generic-sharing.c
+	// We use these instead of the normal ValueTuple types to avoid linking in the
+	// c# methods belonging to those types
+	internal struct ValueTuple
+	{
+	}
+
+    internal struct ValueTuple<T1>
+    {
+        public T1 Item1;
+	}
+
+    internal struct ValueTuple<T1, T2>
+    {
+        public T1 Item1;
+        public T2 Item2;
+	}
+
+    internal struct ValueTuple<T1, T2, T3>
+    {
+        public T1 Item1;
+        public T2 Item2;
+        public T3 Item3;
+	}
+
+    internal struct ValueTuple<T1, T2, T3, T4>
+    {
+        public T1 Item1;
+        public T2 Item2;
+        public T3 Item3;
+        public T4 Item4;
+	}
+
+    internal struct ValueTuple<T1, T2, T3, T4, T5>
+    {
+        public T1 Item1;
+        public T2 Item2;
+        public T3 Item3;
+        public T4 Item4;
+        public T5 Item5;
+	}
 }