[patch] Allow linkonce_odr aliases

[Rafael Espíndola]

I noticed that gcc produces alias when compiling

void g();
template<typename T>
struct foobar {
  foobar() {
    g();
  }
};
foobar<void> x;

To do the same in clang (patch to go in a sec) we have to allow
linkonce_odr aliases in llvm. The attached patch does that.

Cheers,
Rafael
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