[cxx-interop] Do not import std::chrono::time_zone

This type is non-copyable and non-moveable despite having a defaulted move constructor. It cannot currently be expressed in Swift. Let's not try to import it into Swift.

rdar://138123064 / resolves swiftlang#76809

Author: egorzhdan

lib/ClangImporter/ImportDecl.cpp

@@ -2753,7 +2753,8 @@ namespace {
       if (decl->getDeclContext()->isNamespace() &&
           decl->getDeclContext()->getParent()->isStdNamespace() &&
           decl->getIdentifier() &&
-          (decl->getName() == "tzdb" || decl->getName() == "time_zone_link"))
+          (decl->getName() == "tzdb" || decl->getName() == "time_zone_link" ||
+           decl->getName() == "time_zone"))
         return nullptr;
 
       auto &clangSema = Impl.getClangSema();

test/Interop/Cxx/stdlib/use-std-chrono.swift

@@ -4,6 +4,7 @@
 // RUN: %target-run-simple-swift(-I %S/Inputs -cxx-interoperability-mode=upcoming-swift -Xcc -std=c++14)
 // RUN: %target-run-simple-swift(-I %S/Inputs -cxx-interoperability-mode=upcoming-swift -Xcc -std=c++17)
 // RUN: %target-run-simple-swift(-I %S/Inputs -cxx-interoperability-mode=upcoming-swift -Xcc -std=c++20)
+// TODO once macOS CI supports C++23: %target-run-simple-swift(-I %S/Inputs -cxx-interoperability-mode=upcoming-swift -Xcc -std=c++23)
 
 // REQUIRES: executable_test