grep: move is_fixed() earlier to avoid forward declaration
Move the is_fixed() function which are currently only used in compile_regexp() earlier so it can be used in the PCRE family of functions in a later change. Signed-off-by: NÆvar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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