[lra] a patch to fix a testsuite regression on SPARC.

[Vladimir Makarov]

The following patch fixes a few SPARC GCC testsuite regressions.

The patch was successfully bootstrapped on x86/x86-64.

Committed as rev. 184512.

2012-02-23  Vladimir Makarov <vmakarov@redhat.com>

         * lra-eliminations.c (update_reg_eliminate): Make hard register
         unallocatable when we make it a result of the elimination.

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