Remove leftover enum codable flags in tests

Author: drexin

test/IRGen/synthesized_conformance.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend -disable-generic-metadata-prespecialization -emit-ir %s -swift-version 4 -enable-experimental-enum-codable-derivation | %FileCheck %s
+// RUN: %target-swift-frontend -disable-generic-metadata-prespecialization -emit-ir %s -swift-version 4 | %FileCheck %s
 
 struct Struct<T> {
     var x: T

test/IRGen/synthesized_conformance_future.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend -prespecialize-generic-metadata -target %module-target-future -emit-ir %s -swift-version 4 -enable-experimental-enum-codable-derivation | %FileCheck %s -DINT=i%target-ptrsize -DALIGNMENT=%target-alignment
+// RUN: %target-swift-frontend -prespecialize-generic-metadata -target %module-target-future -emit-ir %s -swift-version 4 | %FileCheck %s -DINT=i%target-ptrsize -DALIGNMENT=%target-alignment
 
 // REQUIRES: VENDOR=apple || OS=linux-gnu
 // UNSUPPORTED: CPU=i386 && OS=ios

test/SILGen/synthesized_conformance_enum.swift

@@ -1,5 +1,5 @@
-// RUN: %target-swift-frontend -emit-silgen %s -swift-version 4 -enable-experimental-enum-codable-derivation | %FileCheck -check-prefix CHECK -check-prefix CHECK-FRAGILE %s
-// RUN: %target-swift-frontend -emit-silgen %s -swift-version 4 -enable-library-evolution -enable-experimental-enum-codable-derivation | %FileCheck -check-prefix CHECK -check-prefix CHECK-RESILIENT %s
+// RUN: %target-swift-frontend -emit-silgen %s -swift-version 4 | %FileCheck -check-prefix CHECK -check-prefix CHECK-FRAGILE %s
+// RUN: %target-swift-frontend -emit-silgen %s -swift-version 4 -enable-library-evolution | %FileCheck -check-prefix CHECK -check-prefix CHECK-RESILIENT %s
 
 enum Enum<T> {
     case a(T), b(T)