Imported Upstream version 5.2.0.175

Former-commit-id: bb0468d0f257ff100aa895eb5fe583fb5dfbf900

mcs/class/corlib/corert/Interop.MemAllocFree.cs

@@ -0,0 +1,21 @@
+
+using System;
+
+internal static partial class Interop
+{
+    internal static IntPtr MemAlloc(UIntPtr sizeInBytes)
+    {
+        if (Environment.IsRunningOnWindows)
+            return Windows_MemAlloc(sizeInBytes);
+        else
+            return Unix_MemAlloc(sizeInBytes);
+    }
+
+    internal static void MemFree(IntPtr allocatedMemory)
+    {
+        if (Environment.IsRunningOnWindows)
+            Windows_MemFree(allocatedMemory);
+        else
+            Unix_MemFree(allocatedMemory);
+    }
+}