[NFC] Factor out AsyncCallerExecution migration files into subdirectory

This new directory is a hub for future feature-oriented migration
code (for features that find this separation of concerns appropriate).

Author: AnthonyLatsis

lib/Sema/CMakeLists.txt

@@ -1,7 +1,6 @@
 
 add_swift_host_library(swiftSema STATIC
   AssociatedTypeInference.cpp
-  AsyncCallerExecutionMigration.cpp
   BuilderTransform.cpp
   Comment.cpp
   CSApply.cpp
@@ -39,6 +38,7 @@ add_swift_host_library(swiftSema STATIC
   ImportResolution.cpp
   InstrumenterSupport.cpp
   LookupVisibleDecls.cpp
+  Migration/AsyncCallerExecution.cpp
   MiscDiagnostics.cpp
   OpenedExistentials.cpp
   PCMacro.cpp

lib/Sema/AsyncCallerExecutionMigration.cpp lib/Sema/Migration/AsyncCallerExecution.cpp

@@ -1,4 +1,4 @@
-//===-- Sema/AsyncCallerExecutionMigration.cpp ------------------*- C++ -*-===//
+//===-- Migration/AsyncCallerExecution.cpp ----------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //
@@ -16,7 +16,7 @@
 ///
 //===----------------------------------------------------------------------===//
 
-#include "AsyncCallerExecutionMigration.h"
+#include "AsyncCallerExecution.h"
 #include "swift/AST/ASTContext.h"
 #include "swift/AST/Decl.h"
 #include "swift/AST/DiagnosticsSema.h"

lib/Sema/AsyncCallerExecutionMigration.h lib/Sema/Migration/AsyncCallerExecution.h

@@ -1,4 +1,4 @@
-//===-- Sema/AsyncCallerExecutionMigration.h --------------------*- C++ -*-===//
+//===-- Migration/AsyncCallerExecution.h ------------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //
@@ -16,8 +16,8 @@
 ///
 //===----------------------------------------------------------------------===//
 
-#ifndef SWIFT_SEMA_ASYNCCALLEREXECUTIONMIGRATION_H
-#define SWIFT_SEMA_ASYNCCALLEREXECUTIONMIGRATION_H
+#ifndef SWIFT_SEMA_MIGRATION_ASYNCCALLEREXECUTION_H
+#define SWIFT_SEMA_MIGRATION_ASYNCCALLEREXECUTION_H
 
 #include "swift/AST/ActorIsolation.h"
 #include "swift/AST/ExtInfo.h"
@@ -50,4 +50,4 @@ void warnAboutNewNonisolatedAsyncExecutionBehavior(ASTContext &ctx,
 
 } // end namespace swift
 
-#endif /* SWIFT_SEMA_ASYNCCALLEREXECUTIONMIGRATION_H */
+#endif /* SWIFT_SEMA_MIGRATION_ASYNCCALLEREXECUTION_H */

lib/Sema/TypeCheckConcurrency.cpp

@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "TypeCheckConcurrency.h"
-#include "AsyncCallerExecutionMigration.h"
+#include "Migration/AsyncCallerExecution.h"
 #include "MiscDiagnostics.h"
 #include "TypeCheckDistributed.h"
 #include "TypeCheckInvertible.h"

lib/Sema/TypeCheckType.cpp

@@ -16,7 +16,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "TypeCheckType.h"
-#include "AsyncCallerExecutionMigration.h"
+#include "Migration/AsyncCallerExecution.h"
 #include "TypeCheckAvailability.h"
 #include "TypeCheckConcurrency.h"
 #include "TypeCheckInvertible.h"