PR c/88065 - ICE in -Wsizeof-pointer-memaccess on an invalid strncpy

PR c/88065 - ICE in -Wsizeof-pointer-memaccess on an invalid strncpy

PR c/88065 - ICE in -Wsizeof-pointer-memaccess on an invalid strncpy
PR c/87297 - ICE on strncpy with an undeclared argument

gcc/c-family/ChangeLog:

	PR c/88065
	PR c/87297
	* c-warn.c (sizeof_pointer_memaccess_warning): Bail if source
	or destination is an error.

gcc/testsuite/ChangeLog:

	PR c/88065
	PR c/87297
	* c-c++-common/Wsizeof-pointer-memaccess4.c: New test.

From-SVN: r266594