sfp-machine.h (_FP_DECL_EX): Declare _fpsr as a union of u64 and double.

sfp-machine.h (_FP_DECL_EX): Declare _fpsr as a union of u64 and double.

2016-02-26  Paul E. Murphy  <murphyp@linux.vnet.ibm.com>
	    Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* 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.

Co-Authored-By: Bill Schmidt <wschmidt@linux.vnet.ibm.com>
From-SVN: r233756