Regression tests for comparers

closes dotnet/fsharp#577

commit fe9ee00
Author: Paul Westcott <p...w.e.s.t.c.o.t.t@gmail.com>
Date:   Wed Aug 12 19:41:29 2015 +1000

    Tests that allowing compiler inlining and not

commit 018efe0
Author: Paul Westcott <p...w.e.s.t.c.o.t.t@gmail.com>
Date:   Tue Aug 11 15:31:14 2015 +1000

    Removed the regression tests as they were using compiler optimizations

commit fdf40c0
Author: Paul Westcott <p...w.e.s.t.c.o.t.t@gmail.com>
Date:   Mon Aug 10 15:33:50 2015 +1000

    Added more regression tests for DateTime and Tuples

commit 9de59c9
Author: Paul Westcott <p...w.e.s.t.c.o.t.t@gmail.com>
Date:   Sun Aug 9 20:05:30 2015 +1000

    Regression tests for comparers

Author: Paul Westcott

src/fsharp/FSharp.Core.Unittests/FSharp.Core.Unittests.fsproj

@@ -98,6 +98,7 @@
     <Compile Include="FSharp.Core\Microsoft.FSharp.Collections\CollectionModulesConsistency.fs" Condition="'$(TargetFramework)' != 'portable47' AND '$(TargetFramework)' != 'net20'" />
     <Compile Include="FSharp.Core\Microsoft.FSharp.Collections\StringModule.fs" />
     <Compile Include="FSharp.Core\PrimTypes.fs" />
+    <Compile Include="FSharp.Core\ComparersRegression.fs" />
     <Compile Include="FSharp.Core\DiscrimantedUnionType.fs" /> 
     <Compile Include="FSharp.Core\Microsoft.FSharp.Core\BigIntType.fs" />
     <Compile Include="FSharp.Core\Microsoft.FSharp.Core\IntConversions.fs" />