[Bug rtl-optimization/56833] [4.9 Regression] Valid register is over written by postreload pass

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56833

Bug 56833 depends on bug 57439, which changed state.

Bug 57439 Summary: [4.9 regression] FAIL: gcc.c-torture/execute/920501-6.c 
execution,  -O1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57439

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED