[PATCH] This patch changes the way command line options are printed out.

[Artem Belevich]

Hi echristo,

* If a flag option has an alias, --help will print it next to the
  option. E.g: --preprocess, which is an alias for -E will be printed
  as: --preprocess | -E

* Optionally allow printing out command line options that don't have
  associated HelpText. This is used by Clang's --help-hidden-all I'm
  adding in a separate patch.

http://reviews.llvm.org/D7361

Files:
  include/llvm/Option/OptTable.h
  lib/Option/OptTable.cpp

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