[clang] [Clang][attr] Add 'cfi_salt' attribute (PR #141846)

[Erich Keane via cfe-commits]

erichkeane wrote:

> You need to realize that submitted this code for review in May. It's like that I forgot some of the details of why I wrote something. But what I wrote was intentionally put there for a reason.
> 
> There's a new commit. PTAL.

Honestly, this is a case where I was heavily unmotivated to review your code due to past behavior, and didn't until asked explicitly by Aaron.  It waited due to your inability to respect reviewers in the past.



> And if you're flagging this for "changes required", please list those changes.

Due to me "lacking a fundamental understanding of the code" I need to spend extensive amounts of time familiarizing myself with "the code" before I can release this review.

https://github.com/llvm/llvm-project/pull/141846