Add StringBuilder.Append(ROM<char>) (dotnet/coreclr#20773)

* added Append(ROM<char>)

* address feedback

* revert sln

Commit migrated from https://github.com/dotnet/coreclr/commit/ea5b27d97a392aeda6de31e2724e2eab0ac3a85f

diff --git a/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs b/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs
index 904166f..54218ca 100644 (file)
--- a/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs
@@ -1211,6 +1211,8 @@ namespace System.Text
             return this;
         }
 
+        public StringBuilder Append(ReadOnlyMemory<char> value) => Append(value.Span);
+
         #region AppendJoin
 
         public unsafe StringBuilder AppendJoin(string separator, params object[] values)