fhahn added a comment.

In D92808#2600031 <https://reviews.llvm.org/D92808#2600031>, @thakis wrote:

>> Thank you. Let me know when you have more information.
>
> Repro is moving along. 
> https://bugs.chromium.org/p/chromium/issues/detail?id=1182642#c26 and onward 
> are getting pretty close.

That's interesting, thanks for sharing! I had a look at the linked good.s/bad.s 
and the sequence mentioned in the comments looks unexpected. `mov       x29, 
x29` should be exactly between a regular call and 
`_objc_retainAutoreleasedReturnValue`, but this is not what's happening in this 
case. I could not find a link to download the (pre-processed) source file. 
Would it be possible to get that file?

  Ltmp239:
        bl      _objc_msgSend
  Ltmp705:
        mov     x29, x29
  Ltmp240:
        b       LBB19_3
  LBB19_3:                                ; %invoke.cont4
        .loc    149 0 9                         ; 
../../ios/chrome/browser/ui/infobars/infobar_container_coordinator.mm:0:9
        bl      _objc_retainAutoreleasedReturnValue


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D92808/new/

https://reviews.llvm.org/D92808

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