[PATCH] Declare that musttail calls in variadic functions forward the ellipsis

[Reid Kleckner]

Hi chandlerc, nlewycky,

There is no functionality change here except in the way we assemble and
dump musttail calls in variadic functions. There's really no need to
separate out the bits for musttail and "is forwarding varargs" on call
instructions. A musttail call by definition has to forward the ellipsis
or it would fail verification.

http://reviews.llvm.org/D4892

Files:
  docs/LangRef.rst
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/IR/AsmWriter.cpp
  test/Assembler/musttail-invalid-1.ll
  test/Assembler/musttail-invalid-2.ll
  test/Assembler/musttail.ll
  test/Transforms/Inline/inline-musttail-varargs.ll
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