re PR c/68337 ([MPX] memcpy() for arrays with function pointers results in huge resource usage and binaries)

gcc/

	PR c/68337
	* gimple-fold.c: Include ipa-chkp.h.
	(gimple_fold_builtin_memory_op): Don't fold call if we
	are going to instrument it and it may copy pointers.

gcc/testsuite/

	PR c/68337
	* gcc.target/i386/mpx/pr68337-1.c: New test.
	* gcc.target/i386/mpx/pr68337-2.c: New test.

From-SVN: r230796