2013-10-08  Tim Shen  <timshen91@gmail.com>

	* include/bits/regex_executor.h: Add _TodoList class.
	* include/bits/regex_executor.tcc (_BFSExecutor<>::_M_main): Add
	_M_match_stack and _M_stack to make everything faster. Break if
	_M_stack is empty, to reduce unnecessary idling.
	* testsuite/performance/28_regex/split.cc: New.

From-SVN: r203261