PPC libgcc IEEE128 soft-fp exception/rounding fixes

[Bill Schmidt]

Hi David,

Please ignore this request.  I had asked Paul to do this, but was
confused that it relied on other patches that are not in GCC 5.  My
fault.

Thanks,
Bill

On Mon, 2016-02-29 at 11:33 -0600, Paul E. Murphy wrote:
> Hi David,
> 
> Bill merged this into trunk last week.
> 
> Is it okay to backport this to GCC 5?
> 
> Thanks,
> Paul
> 
> On 02/22/2016 05:51 PM, David Edelsohn wrote:
> > libgcc
> > * config/rs6000/sfp-machine.h:
> > (_FP_DECL_EX): Declare _fpsr as a union of u64 and double.
> > (FP_TRAPPING_EXCEPTIONS): Return a bitmask of trapping
> > exceptions.
> > (FP_INIT_ROUNDMODE): Read the fpscr instead of writing
> > a mystery value.
> > (FP_ROUNDMODE): Update the usage of _fpscr.
> > 
> > Okay.
> > 
> > Thanks, David
> >