[mlir] Remove 'valuesToRemoveIfDead' from PatternRewriter API
Remove 'valuesToRemoveIfDead' from PatternRewriter API. The removal
functionality wasn't implemented and we decided  not to implement it in
favor of having more powerful DCE approaches.
Reviewers: rriddle, bondhugula
Reviewed By: rriddle
Subscribers: liufengdb, mehdi_amini, rriddle, jpienaar, burmako, shauheen, antiagainst, nicolasvasilache, arpith-jacob, mgester, lucyrfox, llvm-commits
Differential Revision: https://reviews.llvm.org/D72545