[Bug tree-optimization/42587] bswap not recognized for memory

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42587

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
I have a patch to fix the second testcase in comment#3.  Note that the original
testcase still fails to be detected.