[Bug 64694] xorg fail to start after llvm upgrade

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64694

Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
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                 CC|                            |deathsimple at vodafone.de

--- Comment #1 from Michel Dänzer <michel at daenzer.net> ---
I bisected this to LLVM r182062: 'Generate debug info for by-value struct args
even if they are not used.' Enabling the DEBUG code in
SelectionDAGISel::LowerArguments(), it complains that "LowerFormalArguments
emitted a null value!".

I suspect SITargetLowering::LowerFormalArguments() needs to be adapted for
this, but I'm not sure how. Christian, can you take a look?

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