[lldb] Instantiate lazily named classes on macOS Ventura.

Recent revisions of the Objective-C runtime changed
objc_debug_class_getNameRaw() in a way that no longer triggers lazy
names to be instantiated. This has the unintended side-effect of making
generic bridged Swift classes, such as _SwiftDeferredNSDictionary<U,V>
to become invisible to the Objective-C runtime.

This patch detects this situation and forces the names to be
instantiated by calling class_getName() and discarding the result before
calling objc_debug_class_getNameRaw() again.

Many thanks to Mike Ash for outlining the solution and Adrian for
authoring the downstream patch.

rdar://95245318

Differential revision: https://reviews.llvm.org/D128306