Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Linq/SqlClient/OptimizationFlags.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace System.Data.Linq.SqlClient {
+    /// <summary>
+    /// Flags that control the optimization of SQL produced.
+    /// Only optimization flags should go here because QA will be looking
+    /// here to see what optimizations they need to test.
+    /// </summary>
+    [Flags]
+    internal enum OptimizationFlags {
+        None = 0,
+        SimplifyCaseStatements = 1,
+        OptimizeLinkExpansions = 2,
+        All = SimplifyCaseStatements | OptimizeLinkExpansions
+    }
+}