Add support for new '\_<' and '\_>' regexp operators, matching the
beginning and ends of symbols. * regex.c (enum syntaxcode): Add Ssymbol. (init_syntax_once): Set the syntax for '_' to Ssymbol, not Sword. (re_opcode_t): New opcodes `symbeg' and `symend'. (print_partial_compiled_pattern): Print the new opcodes properly. (regex_compile): Parse the new operators. (analyse_first): Skip symbeg and symend (they match only the empty string). (mutually_exclusive_p): `symend' is mutually exclusive with \s_ and \sw; `symbeg' is mutually exclusive with \S_ and \Sw. (re_match_2_internal): Match symbeg and symend.
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