Inline test should use struct types

closes https://github.com/Microsoft/visualfsharp/pull/617

commit ab993583655cea2064bf87fbf368856dd91d7789
Author: TIHan <lol.tihan@gmail.com>
Date:   Tue Sep 8 13:14:31 2015 -0700

    Fixed arguments on inline test

commit 4dfd8524cda9d5f690795a5916e7cd627c1eb2ba
Author: Will Smith <lol.tihan@gmail.com>
Date:   Fri Sep 4 23:20:01 2015 -0700

    Inline test should use struct types

tests/fsharp/optimize/inline/lib.fs

@@ -34,6 +34,7 @@ module Vector3MutableField =
     let inline dot (v1: Vector3MutableField) (v2: Vector3MutableField) =
         v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
 
+[<Struct>]
 [<StructLayout (LayoutKind.Sequential)>]
 type Vector3NestedMutableField =
     val x : single
@@ -48,6 +49,7 @@ module Vector3NestedMutableField =
     let inline test (v1: Vector3NestedMutableField) (v2: Vector3NestedMutableField) =
         v1.x * v2.x + v1.y.y * v2.y.y + v1.z * v2.z
 
+[<Struct>]
 [<StructLayout (LayoutKind.Sequential)>]
 type Vector3Generic<'T> =
     val x : 'T
@@ -58,6 +60,12 @@ type Vector3Generic<'T> =
 
 [<RequireQualifiedAccess>]
 [<CompilationRepresentation (CompilationRepresentationFlags.ModuleSuffix)>]
-module Vector3Generic =
+module Vector3GenericInt =
     let inline test (v1: Vector3Generic<int>) (v2: Vector3Generic<int>) =
-        v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
\ No newline at end of file
+        v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
+
+[<RequireQualifiedAccess>]
+[<CompilationRepresentation (CompilationRepresentationFlags.ModuleSuffix)>]
+module Vector3GenericObj =
+    let inline test (v1: Vector3Generic<obj>) (v2: Vector3Generic<obj>) =
+        v1.x

tests/fsharp/optimize/inline/test.fs

@@ -11,5 +11,8 @@ let testVector3MutableFieldDotInline (v1: Vector3MutableField) =
 let testVector3NestedMutableFieldTestInline (v1: Vector3NestedMutableField) =
     Vector3NestedMutableField.test v1 v1
 
-let testVector3GenericInline (v1: Vector3Generic<'T>) =
-    Vector3Generic.test v1 v1
\ No newline at end of file
+let testVector3GenericInline (v1: Vector3Generic<int>) =
+    Vector3GenericInt.test v1 v1
+
+let testVector3GenericInline2 (v1: Vector3Generic<obj>) =
+    Vector3GenericObj.test v1 v1
\ No newline at end of file