parse-options.h: move PARSE_OPT_SHELL_EVAL between enums

Fix a bad landmine of a bug which has been with us ever since
PARSE_OPT_SHELL_EVAL was added in 47e9cd2 (parseopt: wrap
rev-parse --parseopt usage for eval consumption, 2010-06-12).

It's an argument to parse_options() and should therefore be in "enum
parse_opt_flags", but it was added to the per-option "enum
parse_opt_option_flags" by mistake.

Therefore as soon as we'd have an enum member in the former that
reached its value of "1 << 8" we'd run into a seemingly bizarre bug
where that new option would turn on the unrelated PARSE_OPT_SHELL_EVAL
in "git rev-parse --parseopt" by proxy.

I manually checked that no other enum members suffered from such
overlap, by setting the values to non-overlapping values, and making
the relevant codepaths BUG() out if the given value was above/below
the expected (excluding flags=0 in the case of "enum
parse_opt_flags").

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: avar

parse-options.h

@@ -33,6 +33,7 @@ enum parse_opt_flags {
 	PARSE_OPT_KEEP_UNKNOWN = 1 << 3,
 	PARSE_OPT_NO_INTERNAL_HELP = 1 << 4,
 	PARSE_OPT_ONE_SHOT = 1 << 5,
+	PARSE_OPT_SHELL_EVAL = 1 << 6,
 };
 
 enum parse_opt_option_flags {
@@ -44,7 +45,6 @@ enum parse_opt_option_flags {
 	PARSE_OPT_NODASH = 1 << 5,
 	PARSE_OPT_LITERAL_ARGHELP = 1 << 6,
 	PARSE_OPT_FROM_ALIAS = 1 << 7,
-	PARSE_OPT_SHELL_EVAL = 1 << 8,
 	PARSE_OPT_NOCOMPLETE = 1 << 9,
 	PARSE_OPT_COMP_ARG = 1 << 10,
 	PARSE_OPT_CMDMODE = 1 << 11,