[Bug target/53976] [SH] Unnecessary clrt/sett after bt/bf

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53976

--- Comment #9 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Created attachment 34078
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34078&action=edit
Reduced problem from linux kernel

This one exposes a problem of the sh_optimize_sett_clrt RTL pass, where it will
try to visit/evaluate too many basic blocks/edges and eventually run out of
memory.