Use MemoryExtensions.IndexOfAny in PSv2CompletionCompleter` (PowerShell#18245)

Author: xtqqczze

src/System.Management.Automation/engine/CommandCompletion/CommandCompletion.cs

@@ -691,8 +691,9 @@ private static List<CompletionResult> InvokeLegacyTabExpansion(PowerShell powers
         /// </remarks>
         private static class PSv2CompletionCompleter
         {
+            private const string CharsRequiringQuotedString = "`&@'#{}()$,;|<> \t";
+
             private static readonly Regex s_cmdletTabRegex = new Regex(@"^[\w\*\?]+-[\w\*\?]*");
-            private static readonly char[] s_charsRequiringQuotedString = "`&@'#{}()$,;|<> \t".ToCharArray();
 
             #region "Handle Command"
 
@@ -939,7 +940,7 @@ internal static List<CompletionResult> PSv2GenerateMatchSetOfFiles(PowerShellExe
 
             private static string AddQuoteIfNecessary(string completionText, string quote, bool completingAtStartOfLine)
             {
-                if (completionText.IndexOfAny(s_charsRequiringQuotedString) != -1)
+                if (completionText.AsSpan().IndexOfAny(CharsRequiringQuotedString) >= 0)
                 {
                     bool needAmpersand = quote.Length == 0 && completingAtStartOfLine;
                     string quoteInUse = quote.Length == 0 ? "'" : quote;