re PR sanitizer/83392 (FAIL: c-c++-common/ubsan/ptr-overflow-sanitization-1.c  scan-tree-dump-times)

	PR sanitizer/83392
	* sanopt.c (maybe_optimize_ubsan_ptr_ifn): Handle also
	INTEGER_CST offset, add it together with bitpos / 8 and
	sign extend based on POINTER_SIZE.

	* c-c++-common/ubsan/ptr-overflow-sanitization-1.c: Adjust expected
	check count from 17 to 14.

From-SVN: r258516