Update F# compiler to match VS

Author: KevinRansom

build/DependencyVersions.props

@@ -6,7 +6,7 @@
     <CLI_Roslyn_Version>2.3.2-beta1-61921-05</CLI_Roslyn_Version>
     <CLI_Roslyn_Satellites_Version>2.3.0-pre-20170727-1</CLI_Roslyn_Satellites_Version>
     <CLI_DiaSymNative_Version>1.6.0-beta2-25304</CLI_DiaSymNative_Version>
-    <CLI_FSharp_Version>4.2.0-rtm-171020-0</CLI_FSharp_Version>
+    <CLI_FSharp_Version>4.2.0-rtm-171027-0</CLI_FSharp_Version>
     <CLI_FSharp_Satellites_Version>4.4.1-pre-20170727-1</CLI_FSharp_Satellites_Version>
 
     <!-- We'll usually want to keep these versions in sync, but we may want to diverge in some