[llvm] [NewPM][CodeGen] add TargetPassConfig like API (PR #70906)

[via llvm-commits]

paperchalice wrote:

> Is there an order in which I should bring in all these open pull requests(particularly #70906 #77084 #70912 #70922 #76380 #70921) locally? I understand these are still under development but I need to test something urgently.

There is no explicit dependency as far as I know, but they may need rebase to resolve confliction.
BTW, if you have suggestions during the test, any comments are welcome.

https://github.com/llvm/llvm-project/pull/70906