Revert "[Inline][Cloning] Defer simplification after phi-nodes resolution" #87963

Reopens #87534.

Breaks multiple bots:
https://lab.llvm.org/buildbot/#/builders/168/builds/20028
https://lab.llvm.org/buildbot/#/builders/74/builds/27773

And reproducer in a61f9fe3.

This reverts commit a61f9fe3.