c++: Reject ordered comparison of null pointers [PR99701]

c++: Reject ordered comparison of null pointers [PR99701]

When implementing DR 1512 in r11-467 I neglected to reject ordered
comparison of two null pointers, like nullptr < nullptr.  This patch
fixes that omission.

	DR 1512
	PR c++/99701

gcc/cp/ChangeLog:

	* cp-gimplify.c (cp_fold): Remove {LE,LT,GE,GT_EXPR} from
	a switch.
	* typeck.c (cp_build_binary_op): Reject ordered comparison
	of two null pointers.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/nullptr11.C: Remove invalid tests.
	* g++.dg/cpp0x/nullptr46.C: Add dg-error.
	* g++.dg/cpp2a/spaceship-err7.C: New test.
	* g++.dg/expr/ptr-comp4.C: New test.

libstdc++-v3/ChangeLog:

	* testsuite/20_util/tuple/comparison_operators/overloaded.cc:
	Move a line...
	* testsuite/20_util/tuple/comparison_operators/overloaded2.cc:
	...here.  New test.