regex_compiler.h (_Comipler<>::_M_quantifier()): Fix parse error of multiple consecutive quantifiers like "a**".

2014-01-19  Tim Shen  <timshen91@gmail.com>

	* include/bits/regex_compiler.h (_Comipler<>::_M_quantifier()):
	Fix parse error of multiple consecutive quantifiers like "a**".
	* include/bits/regex_compiler.tcc (_Comipler<>::_M_quantifier()):
	Likewise.
	* testsuite/28_regex/basic_regex/multiple_quantifiers.cc: New.

From-SVN: r206783