[Bug tree-optimization/82434] -fstore-merging does not work reliably.

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82434

--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
-Dbool=char lets it merge the stores, I guess this is because bool has
precision < bitsize.