SILGen: Rename SILGenBackDeploy.cpp to SILGenAvailability.cpp.

NFC.

Author: tshortli

lib/SILGen/CMakeLists.txt

@@ -11,7 +11,7 @@ add_swift_host_library(swiftSILGen STATIC
   SwitchEnumBuilder.cpp
   SILGen.cpp
   SILGenApply.cpp
-  SILGenBackDeploy.cpp
+  SILGenAvailability.cpp
   SILGenBridging.cpp
   SILGenBuilder.cpp
   SILGenBuiltin.cpp

lib/SILGen/SILGenBackDeploy.cpp renamed to lib/SILGen/SILGenAvailability.cpp

@@ -1,8 +1,8 @@
-//===--- SILGenBackDeploy.cpp - SILGen for back deployment ----------------===//
+//===--- SILGenAvailability.cpp - SILGen for availability queries ---------===//
 //
 // This source file is part of the Swift.org open source project
 //
-// Copyright (c) 2022 Apple Inc. and the Swift project authors
+// Copyright (c) 2022 - 2025 Apple Inc. and the Swift project authors
 // Licensed under Apache License v2.0 with Runtime Library Exception
 //
 // See https://swift.org/LICENSE.txt for license information