Rollup merge of #134244 - Enselic:no-mut-hint-for-raw-ref, r=jieyouxu

rustc_borrowck: Stop suggesting the invalid syntax `&mut raw const`

A legitimate suggestion would be to change from

    &raw const val

to

    &raw mut val

But until we have figured out how to make that happen we should at least
stop suggesting invalid syntax.

I recommend review commit-by-commit.

Part of #127562

Author: matthiaskrgr