re PR tree-optimization/84526 (ICE in generic_overlap at gcc/gimple-ssa-warn-restrict.c:927 since r257860)

gcc/ChangeLog:

	PR tree-optimization/84526
	* gimple-ssa-warn-restrict.c (builtin_memref::set_base_and_offset):
	Remove dead code.
	(builtin_access::generic_overlap): Be prepared to handle non-array
	base objects.

gcc/testsuite/ChangeLog:

	PR tree-optimization/84526
	* gcc.dg/Wrestrict-10.c: New test.
	* gcc.dg/Wrestrict-11.c: New test.

From-SVN: r258394