Add a PR reference.

From-SVN: r182506

Add a PR reference.
From-SVN: r182506
77a748f8 · Richard Sandiford · 4f7002c5 · 77a748f8
Commit 77a748f8 authored Dec 19, 2011 by Richard Sandiford
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 2011-12-19  Richard Sandiford  <rdsandiford@googlemail.com>

+	PR rtl-optimization/42839
 	* fwprop.c (forward_propagate_subreg): Skip the SIGN/ZERO_EXTEND
 	optimization if the source register is already extended.