[match-and-simplify] fix segfault in parser::parse_for

[Prathamesh Kulkarni]

genmatch segfaults if user-defined operator is not specified.

eg:
(for (oper1 oper2...)
  pattern)

* genmatch.c
  (parser::parse_for): Call peek instead of peek_ident.

Thanks,
Prathamesh
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