[match-and-simplify] set simplify::capture_max to 0 if pattern contains no captures

[Prathamesh Kulkarni]

Caused segfault for pattern containing no captures at:
info.safe_grow_cleared(capture_max + 1); in capture_info::capture_info

artificial test-case:
(define_predicates integer_zerop)
(simplify
  (bit_not integer_zerop)
  { build_zero_cst (type); })

* genmatch.c
  (simplify::simplify): Set simplify::capture_max to 0 if pattern
contains no captures.

Thanks,
Prathamesh
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