[Bug target/53513] [SH] Add support for fschg and fpchg insns and improve fenv support

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53513

--- Comment #38 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #37)
> Created attachment 33751 [details]
> Use SImode for FPSCR, add __builtin_sh_get_fpscr, __builtin_sh_set_fpscr
> 
> I'm now testing this patch.

... there are no new failures for -m4 -ml and -m4 -mb.  I'm tempted to apply
it.  Kaz, do you have any objections?