Merge in 'release/6.0' changes

Author: dotnet-bot

src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs

@@ -48,6 +48,7 @@ public static partial class PlatformDetection
         public static bool IsNotArm64Process => !IsArm64Process;
         public static bool IsArmOrArm64Process => IsArmProcess || IsArm64Process;
         public static bool IsNotArmNorArm64Process => !IsArmOrArm64Process;
+        public static bool IsX86Process => RuntimeInformation.ProcessArchitecture == Architecture.X86;
         public static bool IsArgIteratorSupported => IsMonoRuntime || (IsWindows && IsNotArmProcess);
         public static bool IsArgIteratorNotSupported => !IsArgIteratorSupported;
         public static bool Is32BitProcess => IntPtr.Size == 4;

src/libraries/System.Globalization/tests/IcuTests.cs

@@ -10,7 +10,9 @@ namespace System.Globalization.Tests
     public class IcuTests
     {
         private static bool IsIcuCompatiblePlatform => PlatformDetection.IsNotWindows ||
-                                                       PlatformDetection.IsWindows10Version1903OrGreater;
+                                                       PlatformDetection.IsWindows10Version1903OrGreater &&
+                                                        // Server core doesn't have icu.dll on SysWOW64
+                                                        !(PlatformDetection.IsWindowsServerCore && PlatformDetection.IsX86Process);
 
         [ConditionalFact(nameof(IsIcuCompatiblePlatform))]
         public static void IcuShouldBeUsedByDefault()

src/libraries/System.IO.FileSystem/tests/Directory/CreateDirectory.cs

@@ -270,8 +270,10 @@ public void DirectoryLongerThanMaxLongPathWithExtendedSyntax_ThrowsException()
         {
             var paths = IOInputs.GetPathsLongerThanMaxLongPath(GetTestFilePath(), useExtendedSyntax: true);
 
+            // Ideally this should be PathTooLongException or DirectoryNotFoundException but on some machines
+            // windows gives us ERROR_INVALID_NAME, producing IOException.
             Assert.All(paths, path =>
-                AssertExtensions.ThrowsAny<PathTooLongException, DirectoryNotFoundException>(() => Create(path)));
+                AssertExtensions.ThrowsAny<PathTooLongException, DirectoryNotFoundException, IOException>(() => Create(path)));
         }
 
         [ConditionalFact(nameof(LongPathsAreNotBlocked), nameof(UsingNewNormalization))]