[rfa:rs6000] Simplify alloca reg fetch

[Andrew Cagney]

Hello,

The attatched replaces some hardwired code for fetching the alloca 
register with a call to frame_register_read().

The code is equivalent (except for the case where, for some reason, the 
register isn't available where the new code is more robust).

(This is what was breaking the register cache code).

Andrew
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