[Bug target/92549] Use x86 xchg instruction more

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92549

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |segher at gcc dot gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
But it looks like x86 has exactly patterns like this - but in this case
I guess combine won't ever try this because hardregs are invovled
(not sure if it ever tries to "simplify" the three-set into the parallel
two-set variant)