[ObjectYAML] Add ability for DWARFYAML to calculate DIE lengths

This patch adds the ability for the ObjectYAML DWARFEmitter to calculate
the lengths of DIEs. This is accomplished by creating a DIEFixupVisitor
class which traverses the DWARF DIEs to calculate and fix up the lengths
in the Compile Unit header.

The DIEFixupVisitor can be extended in the future to enable more complex
fix ups which will enable simplified YAML string representations.

This is also very useful when using the YAML format in unit tests
because you no longer need to know the length of the compile unit when
writing the YAML string.

Differential commandeered from Chris Bieneman (beanz)

Differential revision: https://reviews.llvm.org/D30666

llvm-svn: 330421

0 files changed, 0 insertions, 0 deletions