PR c++/59231
	PR c++/11586
	PR c++/14710
	PR c++/57132
gcc/
	* c-common.c (shorten_compare): Don't check
	c_inhibit_evaluation_warnings.
gcc/cp/
	* pt.c (struct warning_sentinel): New.
	(tsubst_copy_and_build): Use it instead of
	c_inhibit_evaluation_warnings.

From-SVN: r208183