Uniquify struct value's alias set on SPARC

[Eric Botcazou]

This patch makes it possible for CSE to propagate into loads of arguments from 
memory, for calls that return a structure, past the insn that sets the struct 
value address, on SPARC 32-bit.

Bootstrapped/regtested on sparc-sun-solaris2.[5678], applied to mainline.


2005-03-14  Eric Botcazou  <ebotcazou@libertysurf.fr>

	* config/sparc/sparc.c (struct_value_alias_set): New global variable.
	(sparc_override_options): Initialize it.
	(sparc_struct_value_rtx): Set it on the MEM to be returned.


-- 
Eric Botcazou
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