Do not use floating point registers when compiling with -msoft-float for SPARC

Do not use floating point registers when compiling with -msoft-float for SPARC

2015-09-28  Daniel Cederman  <cederman@gaisler.com>

Do not use floating point registers when compiling with -msoft-float for SPARC

__builtin_apply* and __builtin_return accesses the floating point registers on
SPARC even when compiling with -msoft-float.

gcc/
	* config/sparc/sparc.c (sparc_function_value_regno_p): Do not return
	true on %f0 for a target without FPU.
	* config/sparc/sparc.md (untyped_call): Do not save %f0 for a target
	without FPU.
	(untyped_return): Do not load %f0 for a target without FPU.

From-SVN: r228183