Auto merge of #130775 - jieyouxu:revert-129047, r=nagisa

Revert "Apply EarlyOtherwiseBranch to scalar value #129047"

This reverts PR #129047, commit a772336fb3fbd1fe4493077fcfe04e0221296a99, reversing changes made to 702987f75b74f789ba227ee04a3d7bb1680c2309.

cc `@DianQK` and `@cjgillot` as the PR author and reviewer of #129047 respectively.

It seems [Apply EarlyOtherwiseBranch to scalar value #129047](https://github.com/rust-lang/rust/pull/129047) may have lead to several nightly regressions:

- https://github.com/rust-lang/rust/issues/130769
- https://github.com/rust-lang/rust/issues/130774
- https://github.com/rust-lang/rust/issues/130771

Example test that would ICE with changes in #129047 (this test is included in this PR):

```rs
//@ compile-flags: -C opt-level=3
//@ check-pass

use std::task::Poll;

pub fn poll(val: Poll<Result<Option<Vec<u8>>, u8>>) {
    match val {
        Poll::Ready(Ok(Some(_trailers))) => {}
        Poll::Ready(Err(_err)) => {}
        Poll::Ready(Ok(None)) => {}
        Poll::Pending => {}
    }
}
```

Since this is a mir-opt ICE that seems to quite easy to trigger with real-world crates being affected, let's revert for now and reland the mir-opt after these are fixed.

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