Simplify prog1 implementation
Inspired by a suggestion from Chris Gregory in: http://lists.gnu.org/archive/html/emacs-devel/2016-12/msg00965.html On my platform, this generates exactly the same machine insns. * src/eval.c (prog_ignore): Rename from unwind_body, since it’s more general than that. All callers changed. (Fprog1): Simplify by using prog_ignore. (Fwhile): Clarify by using prog_ignore.
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