Wrap the swift compiler produced during the build

--- a/tools/driver/CMakeLists.txt
+++ b/tools/driver/CMakeLists.txt
@@ -16,6 +16,13 @@ if(${LIBSWIFT_BUILD_MODE} MATCHES "BOOTSTRAPPING.*")
                           swiftDriverTool
                           libswiftStub)
 
+  # Nix: wrap the swift build.
+  add_custom_command(
+    TARGET swift-frontend-bootstrapping0 POST_BUILD
+    COMMAND nix-swift-make-swift-wrapper $<TARGET_FILE:swift-frontend-bootstrapping0>
+    VERBATIM
+  )
+
   swift_create_post_build_symlink(swift-frontend-bootstrapping0
     SOURCE "swift-frontend${CMAKE_EXECUTABLE_SUFFIX}"
     DESTINATION "swiftc${CMAKE_EXECUTABLE_SUFFIX}"
@@ -34,6 +41,13 @@ if(${LIBSWIFT_BUILD_MODE} MATCHES "BOOTSTRAPPING.*")
                           swiftDriverTool
                           libswift-bootstrapping1)
 
+  # Nix: wrap the swift build.
+  add_custom_command(
+    TARGET swift-frontend-bootstrapping1 POST_BUILD
+    COMMAND nix-swift-make-swift-wrapper $<TARGET_FILE:swift-frontend-bootstrapping1>
+    VERBATIM
+  )
+
   swift_create_post_build_symlink(swift-frontend-bootstrapping1
     SOURCE "swift-frontend${CMAKE_EXECUTABLE_SUFFIX}"
     DESTINATION "swiftc${CMAKE_EXECUTABLE_SUFFIX}"
@@ -50,6 +64,13 @@ target_link_libraries(swift-frontend
                         swiftDriverTool
                         libswift)
 
+# Nix: wrap the swift build.
+add_custom_command(
+  TARGET swift-frontend POST_BUILD
+  COMMAND nix-swift-make-swift-wrapper $<TARGET_FILE:swift-frontend>
+  VERBATIM
+)
+
 # Create a `swift-driver` executable adjacent to the `swift-frontend` executable
 # to ensure that `swiftc` forwards to the standalone driver when invoked.
 swift_create_early_driver_copies(swift-frontend)