bug#17604: dfa: avoid to clear a transition table for initial state

[Norihiro Tanaka]

If number of DFA states reaches at 1024, all transition tables are
cleared in build_state() in order to avoid out-of-memory.  However, for
initial state that shouldn't be done, because it's always used.

BTW, this patch enables to revert a previous patch "grep: do not count
newline before the start  of buffer", because no longer the code is never
be run through at a first character of a text.

0001-dfa-avoid-to-clear-a-transition-table-for-initial-st.patch
Description: Text document

0002-dfa-revert-grep-do-not-count-newline-before-the-star.patch
Description: Text document