[llvm] r347502 - [DAG] consolidate shift simplifications

[Friedman, Eli via llvm-commits]

On 11/23/2018 12:05 PM, Sanjay Patel via llvm-commits wrote:
> Author: spatel
> Date: Fri Nov 23 12:05:12 2018
> New Revision: 347502
>
> URL: http://llvm.org/viewvc/llvm-project?rev=347502&view=rev
> Log:
> [DAG] consolidate shift simplifications
>
> ...and use them to avoid creating obviously undef values as
> discussed in the post-commit thread for r347478.

This is fine as far as it goes, I guess, but it doesn't really solve 
your problem: replaceAllUsesWith and friends still don't call simplifyShift.

-Eli

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