optimization/10877: [3.3/3.4 regression] miscompilation with -O3 -fPIC on x86

[Andrew Pinski]

The differences in the rtl shows up in testpic.cc.30.rnreg.
The work around in this case is to run with -fno-rename-registers, but 
this might not work in all cases.

Thanks,
Andrew Pinski