Pick correct dependencies when scripting on coreclr (#7889)

* Pick correct dependencies when scripting on coreclr

* Look in pack directory for references

Author: KevinRansom

src/fsharp/CompileOps.fs

@@ -2816,7 +2816,11 @@ type TcConfig private (data: TcConfigBuilder, validate: bool) =
                         let facades = Path.Combine(frameworkRootVersion, "Facades")
                         if Directory.Exists facades then
                             yield facades
-                  ]                    
+                        match frameworkRefsPackDirectory with
+                        | Some path when Directory.Exists(path) ->
+                            yield path
+                        | _ -> ()
+                  ]
         with e -> 
             errorRecovery e range0; [] 
 

src/fsharp/service/FSharpCheckerResults.fs

@@ -2209,7 +2209,7 @@ type FsiInteractiveChecker(legacyReferenceResolver,
 
             let backgroundDiagnostics = [| |]
             let reduceMemoryUsage = ReduceMemoryFlag.Yes
-            let assumeDotNetFramework = true
+            let assumeDotNetFramework = tcConfig.primaryAssembly = PrimaryAssembly.Mscorlib
 
             let applyCompilerOptions tcConfigB  = 
                 let fsiCompilerOptions = CompileOptions.GetCoreFsiCompilerOptions tcConfigB