Steps to reproduce:
1. Open the attached project(ReferenceRewriter.zip)
2. Open the Assets/Scenes/Scene1.unity scene
3. Switch platform to Windows Store
4. Build for WSA Universal 10 SDK
5. Observe the error in the Console window:
Reference Rewriter found some errors while running with command --target="Temp\StagingArea\For.Testing.dll" --additionalreferences="Temp\StagingArea","C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.15063.0\Facade"
Reference rewriter: Error: method `System.Boolean System.Type::op_Inequality(System.Type,System.Type)` doesn't exist in target framework

Expected result: Reference rewriter should be able to process a inequality operator
Actual result: Editors gives the error

Reproduced with: 2017.1.1p4, 2017.2.0f2, 2017.3.0b3

Fixed in: 2017.3.0b8, 2018.1.0a2