Improve tests for std::vector<bool> printer

Improve tests for std::vector<bool> printer

The current tests wouldn't notice if the vector<bool> contents were
printed in reverse, because it would read the same forwards and
backwards. Change the content so the tests would fail if that happened.

	* testsuite/libstdc++-prettyprinters/simple.cc: Use non-palindromic
	vector<bool> for test.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

From-SVN: r272499