[PATCH] [tablegen] Add !listconcat operator with the similar semantics as !strconcat

[Daniel Sanders]

It concatenates two or more lists. In addition to the !strconcat semantics
the lists must have the same element type.

My overall aim is to make it easy to append to Instruction.Predicates
rather than override it. This can be done by concatenating lists passed as
arguments, or by concatenating lists passed in additional fields.

http://reviews.llvm.org/D3506

Files:
  docs/TableGen/LangIntro.rst
  docs/TableGen/LangRef.rst
  include/llvm/TableGen/Record.h
  lib/TableGen/Record.cpp
  lib/TableGen/TGLexer.cpp
  lib/TableGen/TGLexer.h
  lib/TableGen/TGParser.cpp
  test/TableGen/listconcat.td
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