[test] Update ASTGen tests for single expression returns

These now work because we're doing the transform
in Sema. Closure parameter generation still needs
some extra work unfortunately, so we can't add
tests for that.

Author: hamishknight

test/ASTGen/decls.swift

@@ -67,16 +67,17 @@ func test7() {
 
 func test8(_: Int) {}
 
+func test9() -> Int { 0 }
+
 func testVars() {
   var a = 0
   var b: Int = 0
   var c, d: Int
   var e, f: Int, g, h, i: String
   let j: Int = 0, k: String = ""
 
-  // FIXME: We don't yet handle single expression bodies.
-  var l: Int { return 0 }
-  var m: Int { get { return 0 } }
+  var l: Int { 0 }
+  var m: Int { get { 0 } }
   var n: Int {
     get { return m }
     set {}
@@ -113,9 +114,8 @@ struct TestVars {
   var e, f: Int, g, h, i: String
   let j: Int = 0, k: String = ""
 
-  // FIXME: We don't yet handle single expression bodies.
-  var l: Int { return 0 }
-  var m: Int { get { return 0 } }
+  var l: Int { 0 }
+  var m: Int { get { 0 } }
   var n: Int {
     get { return m }
     set {}
@@ -151,8 +151,7 @@ extension TestVars {
 
 struct TestSubscripts {
   subscript(x: Int) -> Int {
-    // FIXME: We don't yet handle single expression bodies.
-    return 0
+    0
   }
   subscript(y x: Int) -> Int {
     get {