[SPARC] Fix PR target/86806

[Eric Botcazou]

This adds the speculation barrier on SPARC-V9 in the form of membar #Sync.


2018-12-12  Eric Botcazou  <ebotcazou@adacore.com>

	PR target/86806
	* config/sparc/sparc.md (unspecv): Add UNSPECV_SPECULATION_BARRIER.
	(speculation_barrier): New instruction for V9.

-- 
Eric Botcazou
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