[Bug target/86209] Peephole does not happen because the type of zero/sign extended operands is not the same.

[sameerad at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86209

--- Comment #5 from sameerad at gcc dot gnu.org ---
The gimple store merging pass performs load/store merging only if the LHS is
memory or constant. I am also working on the GIMPLE pass which will enhance
this to merge other stores as well. However, wanted to do the performance
measurement, that is why using the peephole2 pass.