tree-optimization/105969 - FPE with array diagnostics

tree-optimization/105969 - FPE with array diagnostics

For a [0][0] array we have to be careful when dividing by the element
size which is zero for the outermost dimension.  Luckily the division
is only for an overflow check which is pointless for array size zero.

2022-06-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/105969
	* gimple-ssa-sprintf.cc (get_origin_and_offset_r): Avoid division
	by zero in overflow check.

	* gcc.dg/pr105969.c: New testcase.

(cherry picked from commit edb9330c29fe8a0a0b76df6fafd6a223a4d0e41f)