[PATCH] SimplifyCFG: don't remove unreachable defaults from switch instructions; exploit them instead!

[Owen Anderson]

Can you update LowerSwitch.cpp to incorporate this optimization?  Otherwise targets that rely on it are losing this functionality.

—Owen

> On Dec 4, 2014, at 3:44 PM, Hans Wennborg <hans at chromium.org> wrote:
> 
> Addressing David's patches.
> 
> http://reviews.llvm.org/D6471
> 
> Files:
>  lib/Transforms/Utils/Local.cpp
>  lib/Transforms/Utils/SimplifyCFG.cpp
>  test/Transforms/SimplifyCFG/UnreachableEliminate.ll
>  test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
>  test/Transforms/SimplifyCFG/switch-range-to-icmp.ll
>  test/Transforms/SimplifyCFG/switch-to-select-two-case.ll
> <D6471.16960.patch>_______________________________________________
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