Reduce allocations

Author: davidwengier

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/Extensions/SourceTextExtensions.cs

@@ -341,13 +341,11 @@ public static bool HasLFLineEndings(this SourceText text)
 
         foreach (var line in text.Lines)
         {
-            var lineBreakSpan = TextSpan.FromBounds(line.End, line.EndIncludingLineBreak);
-            var lineBreak = line.Text?.ToString(lineBreakSpan) ?? string.Empty;
-            if (lineBreak == "\r\n")
+            if (line.EndIncludingLineBreak - line.End == 2)
             {
                 crlfCount++;
             }
-            else if (lineBreak == "\n")
+            else
             {
                 lfCount++;
             }