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(safe_alloca_unwind): Use it.
* lisp.h (free_save_value): New prototype.
* editfns.c (save_excursion_save): Use Lisp_Misc_Save_Value.
Add comment.
(save_excursion_restore): Adjust to match saved data structure.
Use free_save_value to offload some work from GC.  Drop obsolete
#if 0 code.