Commits on Nov 11, 2019

1. Fix zero-sized aggregate ABI on powerpc …

   For targets that pass zero-sized aggregates indirectly (generally
   those that pass all aggregates indirectly), we must allocate a register
   for passing the address of the ZST. Clean up the existing cases and add
   powerpc, which requires this as well.
   
   While there are not currently musl targets for s390x or sparc64, they
   would have the same ABI as gnu targets, so remove the env == "gnu" check
   in the Linux case.
   
   Ideally, since it is a property of the C ABI, the `!rust_abi` case would
   be handled entirely in `adjust_c_abi`. However, that would require
   updating each implementation of `compute_abi_info` to handle ZSTs.

   

   smaeul committed Nov 11, 2019
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