[PATCH] Add 'musttail' marker to call instructions

[Reid Kleckner]

Hi nicholas, chandlerc,

This is similar to the 'tail' marker, except that it guarantees that
tail call optimization will occur.  It also comes with convervative IR
verification rules that ensure that tail call optimization is possible.

http://llvm-reviews.chandlerc.com/D3240

Files:
  docs/LangRef.rst
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/CallSite.h
  include/llvm/IR/Instructions.h
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/AsmParser/LLToken.h
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/IR/AsmWriter.cpp
  lib/IR/Verifier.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM64/ARM64ISelLowering.cpp
  lib/Target/Mips/MipsISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/Bitcode/tailcall.ll
  test/CodeGen/X86/musttail.ll
  test/Verifier/musttail-invalid.ll
  test/Verifier/musttail-valid.ll
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