PR middle-end/92026 - gcc.dg/Wstringop-overflow-18.c FAIL

PR middle-end/92026 - gcc.dg/Wstringop-overflow-18.c FAIL

PR middle-end/92026 - gcc.dg/Wstringop-overflow-18.c FAIL
PR middle-end/92014 - bogus warning: writing 8 bytes into a region of size 1 in timezone/zic.c

gcc/ChangeLog:
	* tree-ssa-strlen.c (count_nonzero_bytes): Avoid recursing for MEM_REF
	again once nbytes has been set.  Set the access size when not yet set.

gcc/testsuite/ChangeLog:

	PR middle-end/92014
	* gcc.dg/Wstringop-overflow-19.c: New test.

From-SVN: r276711