Add SpanBasedStringBuilder.Append(ReadOnlyMemory<char>)
Add SpanBasedStringBuilder.Append(ReadOnlyMemory<char>)

sean-gilliam/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,mono/msbuild,rainersigwald/msbuild,mono/msbuild,mono/msbuild,mono/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild