[PATCH] Add DWARFFormValue::getAsSignedConstant().

[Frederic Riss]

Hi dblaikie,

This will be used to dump some attributes in a natural (decimal) form.

It's not easy to come up with some code that would generate signed entities
in all the supported forms, thus I'm adding a unittest for the functionality.
Most of the test is actually boilerplate dummy objects that are required to
parse a DWARFFormValue.

http://reviews.llvm.org/D5630

Files:
  include/llvm/DebugInfo/DWARFFormValue.h
  lib/DebugInfo/DWARFFormValue.cpp
  unittests/DebugInfo/DWARFFormValueTest.cpp
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