[Xtensa] revert change to test synchronization builtins

Bob Wilson bwilson@tensilica.com
Wed Sep 12 18:25:00 GMT 2007

This patch reverts my previous change to enable testing  
synchronization builtins on Xtensa.  I had forgotten that not all  
Xtensa processors can support this feature.  Committed on mainline.

2007-09-12  Bob Wilson  <bob.wilson@acm.org>

         * lib/target-supports.exp  
         Revert change to add xtensa.
         (check_effective_target_sync_char_short): Likewise.

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