[PATCH] clang-format recognizes alternative binary operator keywords

[Bobby Moretti]

clang-format does not lex the ISO 646 alternative operator keywords as operators; rather, it interprets them as normal identifiers.

This would result in code such as `(a) and (b)` getting reformatted as `(a)and(b)`.

As a result of some discussion on cfe-dev, this patch changes the lexer option used by clang-format to interpret these keywords as operators and not identifiers.

http://reviews.llvm.org/D3634

Files:
  include/clang/Format/Format.h
  lib/Format/Format.cpp
  tools/clang-format/ClangFormat.cpp
  unittests/Format/FormatTest.cpp
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