Make polysharp private reference

Author: hadashiA

src/Utf8StringInterpolation/Shims.cs

@@ -3,57 +3,6 @@
 using System.Buffers.Text;
 using System.Text;
 
-#if !NET6_0_OR_GREATER
-namespace System.Runtime.CompilerServices
-{
-    /// <summary>
-    /// Indicates the attributed type is to be used as an interpolated string handler.
-    /// </summary>
-    [global::System.AttributeUsage(
-        global::System.AttributeTargets.Class |
-        global::System.AttributeTargets.Struct,
-        AllowMultiple = false, Inherited = false)]
-    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
-    internal sealed class InterpolatedStringHandlerAttribute : global::System.Attribute
-    {
-    }
-
-    /// <summary>
-    /// Indicates which arguments to a method involving an interpolated string handler should be passed to that handler.
-    /// </summary>
-    [global::System.AttributeUsage(global::System.AttributeTargets.Parameter, AllowMultiple = false, Inherited = false)]
-    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
-    internal sealed class InterpolatedStringHandlerArgumentAttribute : global::System.Attribute
-    {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="global::System.Runtime.CompilerServices.InterpolatedStringHandlerArgumentAttribute"/> class.
-        /// </summary>
-        /// <param name="argument">The name of the argument that should be passed to the handler.</param>
-        /// <remarks><see langword="null"/> may be used as the name of the receiver in an instance method.</remarks>
-        public InterpolatedStringHandlerArgumentAttribute(string argument)
-        {
-            Arguments = new string[] { argument };
-        }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="global::System.Runtime.CompilerServices.InterpolatedStringHandlerArgumentAttribute"/> class.
-        /// </summary>
-        /// <param name="arguments">The names of the arguments that should be passed to the handler.</param>
-        /// <remarks><see langword="null"/> may be used as the name of the receiver in an instance method.</remarks>
-        public InterpolatedStringHandlerArgumentAttribute(params string[] arguments)
-        {
-            Arguments = arguments;
-        }
-
-        /// <summary>
-        /// Gets the names of the arguments that should be passed to the handler.
-        /// </summary>
-        /// <remarks><see langword="null"/> may be used as the name of the receiver in an instance method.</remarks>
-        public string[] Arguments { get; }
-    }    
-}
-#endif
-
 namespace Utf8StringInterpolation
 {
     internal static partial class Shims

src/Utf8StringInterpolation/Utf8StringInterpolation.csproj

@@ -36,4 +36,10 @@
 		</Compile>
 	</ItemGroup>
 
+	<ItemGroup>
+	  <PackageReference Include="PolySharp" Version="1.14.0">
+	    <PrivateAssets>all</PrivateAssets>
+	    <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+	  </PackageReference>
+	</ItemGroup>
 </Project>