RemoteAST: Add a test to ensure we support multiple arguments vs a single tuple argument

Author: slavapestov

test/RemoteAST/structural_types.swift

@@ -37,6 +37,14 @@ typealias Fn8 = (String, Int, Double, Float) -> ()
 printType(Fn8.self)
 // CHECK: found type: (String, Int, Double, Float) -> ()
 
+typealias Fn9 = ((Int, Float)) -> ()
+printType(Fn9.self)
+// CHECK: found type: ((Int, Float)) -> ()
+
+typealias Fn10 = (Int...) -> ()
+printType(Fn10.self)
+// CHECK: found type: (Int...) -> ()
+
 typealias Tuple1 = (Int, Float, Int)
 printType(Tuple1.self)
 // CHECK: found type: (Int, Float, Int)