[patch] Support multiple comdat sections with the same name but different groups

[David Blaikie]

In working on DWARF type_units I came across a need to emit multiple ELF
sections of the same name but in different comdat groups. The integrated
assembler doesn't seem to cope with that, so I've taken a (completely
uninformed and reductionist) hack at trying to add such support.

This has mostly been driven by a pure "what code changes cause LLVM to
produce the desired output/pass the test", so I make no claims that is
right or complete, just the best effort with limited knowledge. I'd
appreciate any advice on how better to go about this or other test cases I
haven't considered, etc.

Thanks,
- Dave
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