i386.h (IS_STACK_MODE): Enable for TARGET_MIX_SSE_I387.

i386.h (IS_STACK_MODE): Enable for TARGET_MIX_SSE_I387.

	* config/i386/i386.h (IS_STACK_MODE): Enable for
	TARGET_MIX_SSE_I387.  Rewrite using X87_FLOAT_MODE_P and
	SSE_FLOAT_MODE_P macros.
	* config/i386/i386.c (ix86_preferred_reload_class): Use
	IS_STACK_MODE, INTEGER_CLASS_P and FLOAT_CLASS_P macros.  Cleanup
	regclass processing for CONST_DOUBLE_P.
	(ix86_preferred_output_reload_class): Use IS_STACK_MODE macro.
	(ix86_rtx_costs): Remove redundant TARGET_80387 check
	with IS_STACK_MODE macro.
	* config/i386/i386.md: Replace SSE_FLOAT_MODE_P (DFmode)
	with TARGET_SSE2.
	(*movdf_internal): Use IS_STACK_MODE macro.
	(*movsf_internal): Ditto.

From-SVN: r236607