[libc++][TZDB] Makes implementation experimental. (#95657)

This moves the files to libcxx/src/experimental/ as discussed in #90394.

Fixes: llvm/llvm-project#94902
NOKEYCHECK=True
GitOrigin-RevId: 9d6b68b63f02e0fa3a1dd5b4553cc0d8f17d8777

Author: mordante

src/CMakeLists.txt

@@ -342,16 +342,16 @@ endif()
 
 if (LIBCXX_ENABLE_LOCALIZATION AND LIBCXX_ENABLE_FILESYSTEM AND LIBCXX_ENABLE_TIME_ZONE_DATABASE)
   list(APPEND LIBCXX_EXPERIMENTAL_SOURCES
-    include/tzdb/time_zone_private.h
-    include/tzdb/types_private.h
-    include/tzdb/tzdb_list_private.h
-    include/tzdb/tzdb_private.h
+    experimental/include/tzdb/time_zone_private.h
+    experimental/include/tzdb/types_private.h
+    experimental/include/tzdb/tzdb_list_private.h
+    experimental/include/tzdb/tzdb_private.h
     # TODO TZDB The exception could be moved in chrono once the TZDB library
     # is no longer experimental.
-    chrono_exception.cpp
-    time_zone.cpp
-    tzdb.cpp
-    tzdb_list.cpp
+    experimental/chrono_exception.cpp
+    experimental/time_zone.cpp
+    experimental/tzdb.cpp
+    experimental/tzdb_list.cpp
     )
 endif()
 

src/chrono_exception.cpp renamed to src/experimental/chrono_exception.cpp

@@ -17,7 +17,7 @@
 // Tests the IANA database rules parsing and operations.
 // This is not part of the public tzdb interface.
 // The test uses private implementation headers.
-// ADDITIONAL_COMPILE_FLAGS: -I %{libcxx-dir}/src/include
+// ADDITIONAL_COMPILE_FLAGS: -I %{libcxx-dir}/src/experimental/include
 
 #include <chrono>
 #include <fstream>