[lto] i386.c: Simplify x86_this_parameter.

[Mark Mitchell]

Kazu Hirata wrote:

> Tested on x86_64-pc-linux-gnu.  OK to apply to the LTO branch?
> 
> Kazu Hirata
> 
> 2006-06-10  Kazu Hirata  <kazu@codesourcery.com>
> 
> 	* config/gcc/i386.c (init_cumulative_args): Simplify using
> 	tree_last.

OK.

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Mark Mitchell
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