[PATCH] [X86] Always return the sret parameter in eax/rax, even on 32-bit

[Reid Kleckner]

Hi majnemer,

This rule was always in the old SysV i386 ABI docs and the new ones that
H.J. Lu has put together, but we never noticed:

  EAX   scratch register; also used to return integer and pointer values
        from functions; also stores the address of a returned struct or union

Fixes PR23491.

http://reviews.llvm.org/D9715

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/sret-implicit.ll

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