[PATCH] Defining a new API for debug options that doesn't rely on static global cl::opts.

[Chris Bieneman]

These patches include updates based on Chandler's feedback:

* Now there are no changes to CommandLine.h
* Options.h and Options.cpp have minor code cleanup and style adjustments
* OptionRegistry no longer supports removing options. This support wasn't really used anyways.
* Formatting fixup in Scalarizer.cpp

http://reviews.llvm.org/D5389

Files:
  include/llvm/IR/LLVMContext.h
  include/llvm/PassSupport.h
  include/llvm/Support/Options.h
  lib/Support/CMakeLists.txt
  lib/Support/CommandLine.cpp
  lib/Support/Options.cpp
  lib/Transforms/Scalar/Scalarizer.cpp
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