Auto merge of #97158 - JakobDegen:dse, r=tmiasko,cjgillot

Split dead store elimination off dest prop

This splits off a part of #96451 . I've added this in as its own pass for now, so that it actually runs, can be tested, etc. In the dest prop PR, I'll stop invoking this as its own pass, so that it doesn't get invoked twice.

r? `@tmiasko`