Merge branch 'release/2.1' into release/2.2

src/Shared/HttpSys/RequestProcessing/PathNormalizer.cs

@@ -3,6 +3,8 @@
 
 using System;
 using System.Diagnostics;
+using System.Runtime.InteropServices;
+
 namespace Microsoft.AspNetCore.HttpSys.Internal
 {
     internal static class PathNormalizer
@@ -13,7 +15,7 @@ namespace Microsoft.AspNetCore.HttpSys.Internal
         // In-place implementation of the algorithm from https://tools.ietf.org/html/rfc3986#section-5.2.4
         public static unsafe int RemoveDotSegments(Span<byte> input)
         {
-            fixed (byte* start = input)
+            fixed (byte* start = &MemoryMarshal.GetReference(input))
             {
                 var end = start + input.Length;
                 return RemoveDotSegments(start, end);