re PR libstdc++/47709 (is_heap(standard iterator) becomes ambiguous in C++0x mode)

2011-02-12  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/47709
	* include/ext/algorithm (is_heap): In C++0x mode import from
	namespace std.
	* testsuite/ext/is_heap/47709.cc: New.

From-SVN: r170089