[transferring] Make sure to enable strict-concurrency on the tests as well as our experimental features.

Just noticed this while trying to write some tests that validated that we were
properly ignoring strict-concurrency features. I put in asserts to validate that
when either of these are enabled, we have strict-concurrency set as well.

Author: gottesmm

lib/SILOptimizer/Analysis/RegionAnalysis.cpp

@@ -2965,6 +2965,11 @@ static bool canComputeRegionsForFunction(SILFunction *fn) {
   if (!fn->getASTContext().LangOpts.hasFeature(Feature::RegionBasedIsolation))
     return false;
 
+  assert(fn->getASTContext().LangOpts.StrictConcurrencyLevel ==
+             StrictConcurrency::Complete &&
+         "Need strict concurrency to be enabled for RegionBasedIsolation to be "
+         "enabled as well");
+
   // If this function does not correspond to a syntactic declContext and it
   // doesn't have a parent module, don't check it since we cannot check if a
   // type is sendable.

test/Concurrency/transfernonsendable_strong_transferring_params.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend -emit-sil -disable-availability-checking -enable-experimental-feature TransferringArgsAndResults -verify -enable-experimental-feature RegionBasedIsolation %s -o /dev/null
+// RUN: %target-swift-frontend -emit-sil -parse-as-library -disable-availability-checking -strict-concurrency=complete -enable-experimental-feature TransferringArgsAndResults -verify -enable-experimental-feature RegionBasedIsolation %s -o /dev/null
 
 // REQUIRES: asserts
 
@@ -174,8 +174,7 @@ actor MyActor {
 }
 
 @MainActor func canAssignTransferringIntoGlobalActor3(_ x: transferring Klass) async {
-  await transferToCustom(globalKlass) // expected-warning {{transferring 'globalKlass' may cause a race}}
-  // expected-note @-1 {{transferring main actor-isolated 'globalKlass' to global actor 'CustomActor'-isolated callee could cause races between global actor 'CustomActor'-isolated and main actor-isolated uses}}
+  await transferToCustom(globalKlass) // expected-warning {{task isolated value of type 'Klass' transferred to global actor 'CustomActor'-isolated context}}
 }
 
 func canTransferAssigningIntoLocal(_ x: transferring Klass) async {

test/Concurrency/transfernonsendable_strong_transferring_results.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend -emit-sil -disable-experimental-parser-round-trip -disable-availability-checking -enable-experimental-feature TransferringArgsAndResults -verify -enable-experimental-feature RegionBasedIsolation %s -o /dev/null
+// RUN: %target-swift-frontend -emit-sil -parse-as-library -strict-concurrency=complete -disable-experimental-parser-round-trip -disable-availability-checking -enable-experimental-feature TransferringArgsAndResults -verify -enable-experimental-feature RegionBasedIsolation %s -o /dev/null
 
 // REQUIRES: concurrency
 // REQUIRES: asserts