PR middle-end/94647 - bogus -Warray-bounds on strncpy into a larger member array from a smaller array

gcc/ChangeLog:

	PR middle-end/94647
	* gimple-ssa-warn-restrict.c (builtin_access::builtin_access): Correct
	the computation of the lower bound of the source access size.
	(builtin_access::generic_overlap): Remove a hack for setting ranges
	of overlap offsets.

gcc/testsuite/ChangeLog:

	PR middle-end/94647
	* c-c++-common/Warray-bounds-2.c: Adjust a test case and add a new one.
	* c-c++-common/Warray-bounds-3.c: Add tests for missing warnings.
	* c-c++-common/Wrestrict.c: Invert bounds in printed ranges.
	* gcc.dg/Warray-bounds-59.c: New test.
	* gcc.dg/Wrestrict-10.c: Add a missing warning.
	* gcc.dg/Wrestrict-5.c: Adjust text of expected warning.
	* gcc.dg/Wrestrict-6.c: Expect to see a range of overlap offsets.