Merge branch 'dev15-rc2' into valueTuple4

src/Workspaces/Core/Portable/Workspaces.csproj

@@ -13,6 +13,8 @@
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     <ServiceablePackage>true</ServiceablePackage>
+    <!-- Temporary workaround for CLR bug, VSO #290723. Please remove the below line once this bug is fixed. -->
+    <SkipApplyOptimizations>true</SkipApplyOptimizations>
   </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\Compilers\Core\Portable\CodeAnalysis.csproj">