Add ICloneable back to several globalization types on Unix (#6307)

The globalization implementation used for corefx on Unix came from corert, which didn't have ICloneable, and thus the globalization types that implement ICloneable in desktop and coreclr on Windows don't on Unix.  Now that ICloneable is coming back, we need these types to implement ICloneable appropriately.

Author: stephentoub

src/mscorlib/corefx/System/Globalization/Calendar.cs

@@ -31,7 +31,7 @@ namespace System.Globalization
 
 
     [System.Runtime.InteropServices.ComVisible(true)]
-    public abstract class Calendar
+    public abstract class Calendar : ICloneable
     {
         // Number of 100ns (10E-7 second) ticks per time unit
         internal const long TicksPerMillisecond = 10000;
@@ -143,11 +143,11 @@ public bool IsReadOnly
         //
         //  Clone
         //
-        //  Is the implementation of IColnable.
+        //  Is the implementation of ICloneable.
         //
         ////////////////////////////////////////////////////////////////////////
         [System.Runtime.InteropServices.ComVisible(false)]
-        internal virtual Object Clone()
+        public virtual object Clone()
         {
             object o = MemberwiseClone();
             ((Calendar)o).SetReadOnlyState(false);

src/mscorlib/corefx/System/Globalization/CultureInfo.cs

@@ -47,7 +47,7 @@ namespace System.Globalization
     using StringCultureInfoDictionary = LowLevelDictionary<string, CultureInfo>;
 #endif
 
-    public partial class CultureInfo : IFormatProvider
+    public partial class CultureInfo : IFormatProvider, ICloneable
     {
         //--------------------------------------------------------------------//
         //                        Internal Information                        //

src/mscorlib/corefx/System/Globalization/DateTimeFormatInfo.cs

@@ -55,7 +55,7 @@ internal enum DateTimeFormatFlags
 
 
     [System.Runtime.InteropServices.ComVisible(true)]
-    public sealed class DateTimeFormatInfo : IFormatProvider
+    public sealed class DateTimeFormatInfo : IFormatProvider, ICloneable
     {
         // cache for the invariant culture.
         // invariantInfo is constant irrespective of your current culture.

src/mscorlib/corefx/System/Globalization/NumberFormatInfo.cs

@@ -41,7 +41,7 @@ namespace System.Globalization
     //
 
     [System.Runtime.InteropServices.ComVisible(true)]
-    sealed public class NumberFormatInfo : IFormatProvider
+    sealed public class NumberFormatInfo : IFormatProvider, ICloneable
     {
         // invariantInfo is constant irrespective of your current culture.
         private static volatile NumberFormatInfo invariantInfo;

src/mscorlib/corefx/System/Globalization/TextInfo.cs

@@ -25,7 +25,7 @@
 
 namespace System.Globalization
 {
-    public partial class TextInfo
+    public partial class TextInfo : ICloneable
     {
         ////--------------------------------------------------------------------//
         ////                        Internal Information                        //
@@ -145,7 +145,7 @@ public bool IsReadOnly
         ////  Is the implementation of IColnable.
         ////
         //////////////////////////////////////////////////////////////////////////
-        internal virtual Object Clone()
+        public virtual Object Clone()
         {
             object o = MemberwiseClone();
             ((TextInfo)o).SetReadOnlyState(false);

src/mscorlib/src/System/Globalization/Calendar.cs

@@ -170,7 +170,7 @@ public bool IsReadOnly
         //
         //  Clone
         //
-        //  Is the implementation of IColnable.
+        //  Is the implementation of ICloneable.
         //
         ////////////////////////////////////////////////////////////////////////
         [System.Runtime.InteropServices.ComVisible(false)]

src/mscorlib/src/System/Globalization/TextInfo.cs

@@ -433,7 +433,7 @@ public bool IsReadOnly
         //
         //  Clone
         //
-        //  Is the implementation of IColnable.
+        //  Is the implementation of ICloneable.
         //
         ////////////////////////////////////////////////////////////////////////
         [System.Runtime.InteropServices.ComVisible(false)]