patch to enable LRA for ppc

[Vladimir Makarov]

The following patch permits today trunk to use LRA for ppc by default. 
To switch it off -mno-lra can be used.

The patch was bootstrapped on ppc64.  GCC testsuite does not have
regressions too (in comparison with reload).  The change in rs6000.md is
for fix LRA failure on a recently added ppc test.


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