Add DWARFContext member and accessor to DWARFUnit

[Frédéric Riss]

This is r217128
Thanks!

> On 03 Sep 2014, at 21:04, David Blaikie <dblaikie at gmail.com> wrote:
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> On Wed, Sep 3, 2014 at 11:58 AM, Frédéric Riss <friss at apple.com <mailto:friss at apple.com>> wrote:
> No problem, I’ll rebase the series.
> 
> Is the patch OK with that change? Or do you want to see a patch with a user first ?
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> I think it'll be fine with that change. I can imagine what sort of users will eventually need this.
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>> On 03 Sep 2014, at 20:49, David Blaikie <dblaikie at gmail.com <mailto:dblaikie at gmail.com>> wrote:
>> 
>> Could we pass that by reference instead of pointer, perhaps? (I know there's lots of pointers in the exsting codebase (here and elsewhere), but there's at least some desire to move towards references where practical/reasonable (essentially when rebinding and nullness are not required))
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>> On Wed, Sep 3, 2014 at 11:45 AM, Frédéric Riss <friss at apple.com <mailto:friss at apple.com>> wrote:
>> First preparatory patch of the dwarfdump work. No feature or functional change, just introduce a DWARFContext member in the DWARFUnit that will be used later to make cross-section accesses or to store global state like dumping options.
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>> Ok to go in?
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