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

[Reid Kleckner]

- Use iff

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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