Revert recent commit for libstdc++/26211, now suspended waiting for
	DR 342 (reopened) to reach a new resolution.
	* include/bits/istream.tcc (basic_istream<>::tellg, seekg(pos_type),
	seekg(off_type, ios_base::seekdir)): Remove sentry.
	* testsuite/27_io/basic_istream/seekg/char/26211.cc: Remove.
	* testsuite/27_io/basic_istream/seekg/wchar_t/26211.cc: Likewise.
	* testsuite/27_io/basic_istream/tellg/char/26211.cc: Likewise.
	* testsuite/27_io/basic_istream/tellg/wchar_t/26211.cc: Likewise.
	* testsuite/27_io/basic_istream/seekg/char/8348-1.cc: Revert changes.
	* testsuite/27_io/basic_istream/seekg/wchar_t/8348-1.cc: Likewise.
	* testsuite/27_io/basic_istream/seekg/char/8348-2.cc: Likewise.
	* testsuite/27_io/basic_istream/seekg/wchar_t/8348-1.cc: Likewise.
	* testsuite/27_io/basic_istream/tellg/char/8348.cc: Likewise.
	* testsuite/27_io/basic_istream/tellg/wchar_t/8348.cc: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@111302 138bc75d-0d04-0410-961f-82ee72b054a4