Hi all,

This patch fixes the ICE in the PR by bailing out of find_bswap_or_nop on poly_int sizes.
I don't think it intends to handle them and from my reading of the code it's the most appropriate place to reject them
here rather than in the callers.

Bootstrapped and tested on aarch64-none-linux-gnu.

Ok for trunk?
Thanks,
Kyrill

gcc/
	PR tree-optimization/97546
	* gimple-ssa-store-merging.c (find_bswap_or_nop): Return NULL if type is
	not INTEGER_CST.

gcc/testsuite/
	PR tree-optimization/97546
	* gcc.target/aarch64/sve/acle/general/pr97546.c: New test.