[Localization] Adjust cmake to include serialized diagnostics in toolchain

Building of the diagnostic database to be done in three steps:

- Copy YAMLs from <source>/localization/diagnostics to <build>/share/swift/diagnostics
- Serialize English into <build>/share/swift/diagnostics
- Install everything (YAML and `.db`) from <build>/share/swift/diagnostics
  to share/swift/diagnostics in toolchain

Author: xedin

localization/CMakeLists.txt

@@ -1,21 +1,17 @@
-add_custom_target(diagnostic-translation-database)
+add_custom_target(diagnostic-database)
 
-add_custom_command(
-  TARGET diagnostic-translation-database
-  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-  DEPENDS diagnostics
-  COMMAND "${CMAKE_COMMAND}" -E copy_directory diagnostics/ "${SWIFT_BINARY_DIR}/share/swift/diagnostics/")
+add_custom_command(TARGET diagnostic-database
+  COMMAND
+    ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/diagnostics/ ${CMAKE_BINARY_DIR}/share/swift/diagnostics/
+  COMMAND
+    swift-serialize-diagnostics
+      --input-file-path ${CMAKE_BINARY_DIR}/share/swift/diagnostics/en.yaml
+      --output-directory ${CMAKE_BINARY_DIR}/share/swift/diagnostics/
+)
 
-add_custom_command(
-  TARGET diagnostic-translation-database
-  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-  COMMAND swift-serialize-diagnostics
-    --input-file-path diagnostics/en.yaml
-    --output-directory ${SWIFT_BINARY_DIR}/share/swift/diagnostics)
-
-add_dependencies(swift-frontend diagnostic-translation-database)
+add_dependencies(swift-frontend diagnostic-database)
 
 swift_install_in_component(
-  DIRECTORY diagnostics
-  DESTINATION "share/swift"
+  DIRECTORY ${CMAKE_BINARY_DIR}/share/swift/diagnostics/
+  DESTINATION "share/swift/diagnostics"
   COMPONENT compiler)