experimental feature tests require asserts

When using an experimental feature that is not available
in production, a test needs to have `REQUIRES: asserts`
so that non-assert builds don't unexpectedly fail.

Author: kavon

test/Concurrency/radar_concurrency_nio.swift

@@ -3,6 +3,8 @@
 // RUN: %target-swift-frontend -enable-experimental-move-only %s -emit-sil -o /dev/null -verify -strict-concurrency=complete
 // RUN: %target-swift-frontend -enable-experimental-move-only %s -emit-sil -o /dev/null -verify -strict-concurrency=complete -enable-experimental-feature SendNonSendable
 
+// REQUIRES: asserts
+
 // REQUIRES: concurrency
 
 public protocol EventLoop: Sendable {}

test/Constraints/copyable_requirement.swift

@@ -1,5 +1,7 @@
 // RUN: %target-typecheck-verify-swift -enable-experimental-feature NoncopyableGenerics
 
+// REQUIRES: asserts
+
 // a concrete move-only type
 @_moveOnly struct MO {
   var x: Int?

test/decl/protocol/req/associated_type_tuple.swift

@@ -1,5 +1,7 @@
 // RUN: %target-typecheck-verify-swift -enable-experimental-feature TupleConformances
 
+// REQUIRES: asserts
+
 typealias Tuple<each T> = (repeat each T)
 
 protocol P1 {

test/type/implicit_some/explicit_existential.swift

@@ -1,5 +1,7 @@
 // RUN: %target-typecheck-verify-swift -disable-availability-checking -warn-redundant-requirements  -enable-experimental-feature ImplicitSome
 
+// REQUIRES: asserts
+
 protocol Foo { }
 
 var x: any Foo
@@ -290,5 +292,3 @@ protocol PP {}
 struct A : PP {}
 let _: any PP = A() // Ok
 let _: any (any PP) = A() // expected-error{{redundant 'any' in type 'any (any PP)'}} {{8-12=}}
-
-