[PATCH] Fix invalid code generation (regression) in pass-by-value on PPC32

[Andy Gibbs]

Hi,

Please can someone have a look over the attached patch which fixes a 
regression introduced in the refactoring of code in r208733 causing serious 
invalid code generation on PPC32.

A full bug report is here: https://llvm.org/bugs/show_bug.cgi?id=23097

I'd quite like to get this committed before it is forgotten!

Cheers
Andy

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