Shrink pseudovectors a bit
sizeof (struct Lisp_Marker) was 32 on x86, where 24 would do. Problem noted by Stefan Monnier in: https://lists.gnu.org/r/emacs-devel/2018-09/msg00165.html * src/bignum.h (struct Lisp_Bignum): * src/frame.h (struct frame): * src/lisp.h (struct Lisp_Vector, struct Lisp_Bool_Vector) (struct Lisp_Char_Table, struct Lisp_Hash_Table) (struct Lisp_Marker, struct Lisp_Overlay) (struct Lisp_Misc_Ptr, struct Lisp_User_Ptr) (struct Lisp_Finalizer, struct Lisp_Float) (struct Lisp_Module_Function): * src/process.h (struct Lisp_Process): * src/termhooks.h (struct terminal): * src/thread.h (struct thread_state, struct Lisp_Mutex) (struct Lisp_CondVar): * src/window.c (struct save_window_data): * src/window.h (struct window): * src/xterm.h (struct scroll_bar): * src/xwidget.h (struct xwidget, struct xwidget_view): Add GCALIGNED_STRUCT attribute. * src/lisp.h (GCALIGNED_UNION_MEMBER): Renamed from GCALIGNED_UNION. All uses changed. (GCALIGNED_STRUCT_MEMBER, GCALIGNED_STRUCT, GCALIGNED): New macros. All uses of open-coded GCALIGNED changed to use GCALIGNED. (union vectorlike_header): No longer GC-aligned. (PSEUDOVECSIZE): Yield 0 for pseudovectors without Lisp objects that place a member before where the first Lisp object member would be.
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