[SPARC] Remove useless new code

[Eric Botcazou]

It was introduced in the course of the -mflat rewrite, but can be replaced by a 
single line.

Tested on SPARC/Solaris w/ and w/o -mflat, applied on the mainline.


2012-02-10  Eric Botcazou  <ebotcazou@adacore.com>

	* config/sparc/sparc.c (sparc_flat_expand_prologue): Use emit_use.
	* config/sparc/sparc.md (UNSPECV_GOTO): Delete.
	(nonlocal_goto_internal): Likewise.
	(nonlocal_goto): Emit a use and an indirect jump directly.


-- 
Eric Botcazou
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