[Bug target/113980] risc-v: unnecessary sign-extend after lw with volatile, and more

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113980

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Basically GCC does not optimize around a volatile memory load/stores which
causes artifacts like this.