[PowerPC CodeGen] patch for bug 15763

[Rafael Espíndola]

On 22 April 2013 16:57, David Fang <fang at csl.cornell.edu> wrote:
> Hi all,
>
> Attached is a patch that fixes PIC codegen for PPC on darwin, by privatizing
> all function stubs and lazy pointer symbols in emitted assembly.
>
> http://llvm.org/bugs/show_bug.cgi?id=15763
>
> Could PPC maintainers kindly review/apply?  Thanks.

getPrivateGlobalPrefix can take a twine, so it is probably better to do

const char* Prefix;
if (...)
  Prefix =  = AP.MAI->getPrivateGlobalPrefix();
else
  Prefix = "";
MCSymbol Sym = Ctx.GetOrCreateSymbol(Twine(Prefix) + Twine(Name));

Btw, is there a case where the prefix was already added? I.e., is
Name.startswith(plp) ever true? It would be nice if the prefix could
be added in one central location.

Cheers,
Rafael