re PR c++/49107 ([C++0x][4.7 Regression] incomplete type regression with std::pair)

re PR c++/49107 ([C++0x][4.7 Regression] incomplete type regression with std::pair)

	PR c++/49107
	* cp-tree.h (DEFERRED_NOEXCEPT_SPEC_P): Handle overload.
	* method.c (defaulted_late_check): Only maybe_instantiate_noexcept
	if the declaration had an exception-specifier.
	(process_subob_fn): Don't maybe_instantiate_noexcept.
	* pt.c (maybe_instantiate_noexcept): Handle overload.
	* typeck2.c (nothrow_spec_p_uninst): New.
	(merge_exception_specifiers): Add 'fn' parm.  Build up overload.
	* typeck.c (merge_types): Adjust.

From-SVN: r175073