[PATCH] Verifier: Don't reject varargs callee cleanup functions

[Reid Kleckner]

Hi rafael, nlewycky,

We've rejected these kinds of functions since r28405 in 2006 because
it's impossible to lower the return of a callee cleanup varargs
function. However there are lots of legal ways to leave such a function
without returning, such as aborting. Today we can leave a function with
a musttail call to another function with the correct prototype, and
everything works out.

Therefore I'd like to remove the verifier check just say that a normal
return from such a function is UB.

http://reviews.llvm.org/D5059

Files:
  test/Verifier/musttail-valid.ll
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