vim-patch:7.4.593 #2657

Problem:    Crash when searching for "x\{0,90000}". (Dominique Pelle)
Solution:   Bail out from the NFA engine when the max limit is much higher
            than the min limit.

https://github.com/vim/vim/commit/v7-4-593

See https://groups.google.com/d/msg/vim_dev/c7owwoseba8/ZETgSNZ6p10J

src/nvim/regexp.h

@@ -5,6 +5,7 @@
 #define RE_MAGIC        1       /* 'magic' option */
 #define RE_STRING       2       /* match in string instead of buffer text */
 #define RE_STRICT       4       /* don't allow [abc] without ] */
+#define RE_AUTO         8       /* automatic engine selection */
 
 /* values for reg_do_extmatch */
 #define REX_SET        1       /* to allow \z\(...\), */