[Cherry-pick into next] [lldb] Fix use-after-free in Playgrounds

[adrian-prantl]

commit c64b06a11e1824392574f929fbc62cc304756ab7
Author: Adrian Prantl <[email protected]>
Date:   Mon Mar 3 17:12:41 2025 -0800

    [lldb] Fix use-after-free in Playgrounds
    
    The precise compiler invocations change moved the ownership of the
    SwiftPersistentExpressionState from SwiftASTContext to
    TypeSystemSwiftTypeRef, which makes it shared between all
    SwiftASTCOntextForExpression objects. The LLDB name lookup contained a
    check to avoid finding a persistent result from the wrong context, but
    there was no such check in the REPL name lookup.
    
    This is a problem when a Playground imports a framework that pulls in
    a fresh dylib because this forces a new SwiftASTContext to be created.
    
    Duplicating the check avoids the crash. I further made sure to clear
    the persistent state when the SwiftASTContext is replaced, and added
    several assertions to ensure consistency.
    
    rdar://143923367