[patch][pr17535] Reject alias attributes that point to undefined name (V2).

Rafael EspĂ­ndola rafael.espindola at gmail.com
Mon Oct 21 13:25:18 PDT 2013

The attached patch causes clang to reject alias attributes that point
to undefined names. For example, with this patch we now reject

void f1(void) __attribute__((alias("g1")));

Unlike the previous patch this one is implemented in CodeGen. It is
quiet a bit simpler. The downside is that the errors only fire during

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