(USE_SAFE_ALLOCA): Add and init sa_must_free integer.
(SAFE_ALLOCA, SAFE_ALLOCA_LISP): Increment it when malloc is used. (SAFE_FREE): Test it to determine if we need to unwind to free. Remove size arg. All users changed. (SAFE_FREE_LISP) Remove. All users changed to use SAFE_FREE.
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