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

[kkojima at gcc dot gnu.org]

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

--- Comment #95 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #94)
> Kaz, do you think we can enable LRA by default for GCC 6?

I think that it's OK to make LRA default on trunk, even if it's
better with your R0 pre-allocating pass.
The last time I tested -mlra, there are some regressions, though.
I'd like to test it again.  Could you see any serious problems on
sh-elf with -mlra?