Transferring code ownership for SCEV and IndVars

Hi everyone,

I would like to nominate Philip Reames as the code owner for
ScalarEvolution and IndVars.

-- Sanjoy

Ok, it doesn’t sound like there are any concerns here :-). Assuming no one objects in the next 24 hours, please update CODE_OWNERS. Congratulations Philip, and thank you Sanjoy!

-Chris