Enable CIE version 3 .eh_frame sections

I've run into at least one library that has CIE version 3 .eh_frames.  Before,
Breakpad would simply ignore any entries within the .eh_frame section if it
wasn't version 1:
/usr/lib/libSystem.B.dylib, architecture : CFI frame description entry
at offset 0x148b8 in '__eh_frame': CIE specifies unrecognized version:
3
According to http://www.airs.com/blog/archives/460, the .eh_frame sections only
difference between versions 1 and 3 is the same change that we already account
for in .debug_frame sections: the return address register is LEB128 in version 3
instead of a single byte in version 1.

This patch simply allows reading of version 3 .eh_frame sections.

[mrmiller]

Sorry, I truncated some context lines at the end of the patch file.

[jimb]

Looks good to me!

[jimb]

On 2012/03/15 23:41:02, jimb wrote:
> Looks good to me!

I can land this for you.

[jimb]

On 2012/03/15 23:41:37, jimb wrote:
> On 2012/03/15 23:41:02, jimb wrote:
> > Looks good to me!
> 
> I can land this for you.

Actually, I want to fix up that comment a bit...

[mrmiller]

On 2012/03/15 23:42:20, jimb wrote:
> On 2012/03/15 23:41:37, jimb wrote:
> > On 2012/03/15 23:41:02, jimb wrote:
> > > Looks good to me!
> > 
> > I can land this for you.
> 
> Actually, I want to fix up that comment a bit...

Alright!  I tried to change as little as possible and simply kept the comment up
to date with the change.

[jimb_red-bean.com]

Breakpad appears to be horked at the moment. I'll be on a business
trip next week, so I don't know if I'll be able to get to this until I
return.

On Thu, Mar 15, 2012 at 5:28 PM,  <michaelrmmiller@gmail.com> wrote:
> On 2012/03/15 23:42:20, jimb wrote:
>>
>> On 2012/03/15 23:41:37, jimb wrote:
>> > On 2012/03/15 23:41:02, jimb wrote:
>> > > Looks good to me!
>> >
>> > I can land this for you.
>
>
>> Actually, I want to fix up that comment a bit...
>
>
> Alright!  I tried to change as little as possible and simply kept the
> comment up to date with the change.
>
> http://breakpad.appspot.com/362001/

[mrmiller]

Do we want to pick this back up?

On 2012/03/16 01:54:11, jimb_red-bean.com wrote:
> Breakpad appears to be horked at the moment. I'll be on a business
> trip next week, so I don't know if I'll be able to get to this until I
> return.
> 
> On Thu, Mar 15, 2012 at 5:28 PM,  <mailto:michaelrmmiller@gmail.com> wrote:
> > On 2012/03/15 23:42:20, jimb wrote:
> >>
> >> On 2012/03/15 23:41:37, jimb wrote:
> >> > On 2012/03/15 23:41:02, jimb wrote:
> >> > > Looks good to me!
> >> >
> >> > I can land this for you.
> >
> >
> >> Actually, I want to fix up that comment a bit...
> >
> >
> > Alright! &nbsp;I tried to change as little as possible and simply kept the
> > comment up to date with the change.
> >
> > http://breakpad.appspot.com/362001/

[jimb]

On 2012/04/03 14:22:22, michaelrmmiller wrote:
> Do we want to pick this back up?

Yes --- thanks for the reminder. Let me try landing this again...

[jimb]

Committed as revision 947.

Michael, now you need to mark the issue closed in Rietveld (click on "Edit
Issue").