[lra] patch fixing spec2000 mesa code generation failure

[Vladimir Makarov]

The following patch mostly fixes spec2000 mesa code generation failure 
on x86 triggered by committing hard reg splitting patch.

The patch was successfully bootstrapped on x86-64.

Committed as rev. 188316.

2012-06-07  Vladimir Makarov <vmakarov@redhat.com>

         * lra-constraints.c (split_reg): Fix comments and printing debug
         titles.
         (inherit_in_ebb): Check barrier too.


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