r297702 - [CodeGen][ObjC] Fix a bug where the type of an ivar wasn't encoded

[Akira Hatanaka via cfe-commits]

According to the documentation, the starting position of the field has to be encoded too:

https://gcc.gnu.org/onlinedocs/gcc/Type-encoding.html <https://gcc.gnu.org/onlinedocs/gcc/Type-encoding.html>

I’m not sure whether we need the same information for bitfield ivars though.

> On Jun 22, 2017, at 12:03 PM, Joerg Sonnenberger <joerg at bec.de> wrote:
> 
> On Thu, Jun 22, 2017 at 11:09:48AM -0700, Akira Hatanaka wrote:
>> Do you want the same encoding for the bitfield “int : 1” you saw before r297792, which is just “i"?
>> 
>> The encoding for bitfield is normally bN where N is the number of bits,
>> but the comment in function EncodeBitField says GNU runtime encodes it differently.
> 
> Sorry, can't answer that. I primarily care about a new clang crash that
> didn't exist before, cut I can't answer what the correct behavior should
> be.
> 
> Joerg

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