[PATCH v2 0/3] MR260: ntdll: Improve xstate validation in NtGetContextThread()

[Paul Gofman (＠gofman)]

Supposed to fix SCP: Secret Laboratory intermittent crash at main menu.

The first two patches make the existing validation also work for other thread context query (as context_from_server called through get_thread_context() doesn't do that).

The last patch adds xstate alignment validation with corresponding test.

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  v2: ntdll: Validate xstate alignment in validate_context_xstate().
      ntdll: Validate context xstate at once in NtGetContextThread().
      ntdll: Factor out validate_context_xstate() function.

https://gitlab.winehq.org/wine/wine/-/merge_requests/260