[cfe-commits] review only please: allow #pragma weak to refer to undeclared identifier

[Ryan Flynn]

i'll commit-after-approval, in that unlikely event.

this is a fairly ugly hack to address this bug:

http://llvm.org/bugs/show_bug.cgi?id=3679

it has the upside of getting FreeBSD's libc and others closer to compiling.

it has the downside that it is fairly ugly and also introduces an
issue whereby we don't error on incompatible declarations with weak
attributes, an example is given in the test file.

constructive criticism appreciated.
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