Avoid spurious test failures when -fno-inline in test flags

Avoid spurious test failures when -fno-inline in test flags

These tests rely on inlining, so if -fno-inline is added to the compiler
flags the tests fail. Use the predefined __NO_INLINE__ macro to detect
that situation, and don't bother testing the move assignment.

	* testsuite/21_strings/basic_string/modifiers/assign/char/
	move_assign_optim.cc: Avoid spurious failure when -fno-inline added
	to test flags.
	* testsuite/21_strings/basic_string/modifiers/assign/wchar_t/
	move_assign_optim.cc: Likewise.

From-SVN: r267573