[stack]: Use ix86_gen_XXX

[H.J. Lu]

Hi,

I am checking this patch into stack branch to use
ix86_gen_XXX.

-- 
H.J.
---
2008-06-03  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386.c (ix86_gen_andsp): New.
	(override_options): Initialize ix86_gen_andsp.
	(ix86_expand_prologue): Updated.
	(ix86_expand_epilogue): Likewise.
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