[Bug target/55212] [SH] Switch from IRA to LRA

[kkojima at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55212

--- Comment #54 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
Created attachment 33657
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33657&action=edit
A possible workaround

The patch is trying to fix the result of decompose_mem_address
so as not to assign INDEX_REG_CLASS to both base and index regs
when INDEX_REG_CLASS has one register only.