Rewrite IsAliasReplaceableExpression as iterative instead of recursive

src/Workspaces/CSharp/Portable/Extensions/ExpressionSyntaxExtensions.cs

@@ -1092,6 +1092,11 @@ private static bool PreferPredefinedTypeKeywordInMemberAccess(ExpressionSyntax e
 
         private static bool IsAliasReplaceableExpression(ExpressionSyntax expression)
         {
+            while (expression.IsKind(SyntaxKind.SimpleMemberAccessExpression, out MemberAccessExpressionSyntax currentMember))
+            {
+                expression = currentMember.Expression;
+            }
+
             if (expression.Kind() == SyntaxKind.IdentifierName ||
                 expression.Kind() == SyntaxKind.QualifiedName ||
                 expression.Kind() == SyntaxKind.AliasQualifiedName ||
@@ -1100,9 +1105,6 @@ private static bool IsAliasReplaceableExpression(ExpressionSyntax expression)
                 return true;
             }
 
-            if (expression.IsKind(SyntaxKind.SimpleMemberAccessExpression, out MemberAccessExpressionSyntax memberAccess))
-                return IsAliasReplaceableExpression(memberAccess.Expression);
-
             return false;
         }