Revert "[DSE] Add first version of MemorySSA-backed DSE (Bottom up walk)."
This reverts commit d0c4d4fe.
Revert "[DSE,MSSA] Move more passing test cases from todo to simple.ll."
This reverts commit 02266e64.
Revert "[DSE,MSSA] Adjust mda-with-dbg-values.ll to MSSA backed DSE."
This reverts commit 74f03e4f.