[PATCH] [YAML] Add new method `yaml::IO::maskedBitSetCase()` to simplify handling of bitset flags with enumeration block

[Simon Atanasyan]

The updated patch has the following changes:
# Keep the `bitSetCase()` unchanged and add new method `maskedBitSetCase()`.
# Update the yaml documentation.

I considered to break the `Flags` field into two parts. But I could not invent good names for these fields. The "enumeration" values have different meanings for different targets. Some targets do not use the `Flags` field at all. Moreover I am not sure that there is no target with more than one "enumeration" blocks in the `Flag` field.

http://reviews.llvm.org/D3807

Files:
  docs/YamlIO.rst
  include/llvm/Support/YAMLTraits.h
  lib/Object/ELFYAML.cpp
  test/Object/obj2yaml.test
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