[cxx-interop] Do not import std::__compressed_pair

This type is triggering modularization issues in libc++:
```
error: definition of '__builtin_new_deleter' must be imported from module 'std_private_memory_builtin_new_allocator' before it is required
```

This is a workaround to keep things building.

rdar://142576799

Author: egorzhdan

lib/ClangImporter/ImportDecl.cpp

@@ -2767,6 +2767,7 @@ namespace {
           decl->getDeclContext()->getParent()->isStdNamespace() &&
           decl->getIdentifier() &&
           (decl->getName() == "tzdb" || decl->getName() == "time_zone_link" ||
+           decl->getName() == "__compressed_pair" ||
            decl->getName() == "time_zone"))
         return nullptr;