[Bug tree-optimization/31914] FRE does not do const or copy propagation while it could

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31914
Bug 31914 depends on bug 30997, which changed state.

Bug 30997 Summary: FRE does not simplify comparisons in COND_EXPRs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30997

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