Do not sort named parameters on FunctionNode.

pkg/kernel/testcases/strong-mode/named_parameters.baseline.txt

Index: pkg/kernel/testcases/strong-mode/named_parameters.baseline.txt
diff --git a/pkg/kernel/testcases/strong-mode/named_parameters.baseline.txt b/pkg/kernel/testcases/strong-mode/named_parameters.baseline.txt
index 42aa8f7973d5075daa30b4bb5ebf8dc50fabad6a..279ed4abf1f0ffb2a21a0b7bc2106c15441d7c93 100644
--- a/pkg/kernel/testcases/strong-mode/named_parameters.baseline.txt
+++ b/pkg/kernel/testcases/strong-mode/named_parameters.baseline.txt
@@ -1,3 +1,5 @@
+// ({alpha: dynamic, beta: dynamic}) → dynamic is not a subtype of ({beta: dynamic, alpha: dynamic}) → dynamic (no location)
+// ({beta: dynamic, alpha: dynamic}) → dynamic is not a subtype of ({alpha: dynamic, beta: dynamic}) → dynamic (no location)
 library;
 import self as self;
 import "dart:core" as core;
@@ -7,7 +9,7 @@ class Superclass extends core::Object {
     : super core::Object::•()
     ;
   method foo({dynamic alpha, dynamic beta}) → dynamic {}
-  method bar({dynamic alpha, dynamic beta}) → dynamic {}
+  method bar({dynamic beta, dynamic alpha}) → dynamic {}
   method namedCallback(({alpha: core::String, beta: core::int}) → dynamic callback) → dynamic {
     callback.call(alpha: "one", beta: 2);
     callback.call(beta: 1, alpha: "two");
@@ -17,11 +19,11 @@ class Subclass extends self::Superclass {
   constructor •() → void
     : super self::Superclass::•()
     ;
-  method foo({dynamic alpha, dynamic beta}) → dynamic {}
+  method foo({dynamic beta, dynamic alpha}) → dynamic {}
   method bar({dynamic alpha, dynamic beta}) → dynamic {}
   method namedCallback(({alpha: core::String, beta: core::int}) → dynamic callback) → dynamic {}
 }
-static method topLevelNamed(dynamic beta, dynamic alpha, {dynamic delta, dynamic gamma}) → dynamic {}
+static method topLevelNamed(dynamic beta, dynamic alpha, {dynamic gamma, dynamic delta}) → dynamic {}
 static method topLevelOptional(dynamic beta, dynamic alpha, [dynamic gamma, dynamic delta]) → dynamic {}
 static method main() → dynamic {
   new self::Subclass::•().{self::Subclass::foo}(beta: 1, alpha: 2);