Patch for Bug 30413, including test case

[Akira Hatanaka via cfe-commits]

This patch changes the encoding of an id conforming to a protocol, which I think was not intended: For example:

@encode(id<NSObject>)

Would passing IVD to the call to getObjCEncodingForType in CGObjCGNU::GenerateClass solve the problem?

> On Feb 15, 2017, at 1:59 PM, Lobron, David via cfe-commits <cfe-commits at lists.llvm.org> wrote:
> 
> Hi All,
> 
> I am re-submitting my patch for Bug 30413, this time with a test case included as well (ivar-type-encoding.m).  The test case file should be added to clang/test/CodeGenObjC.  The test verifies that correct metadata is emitted by clang for an object-valued instance variable.  I've verified that the test passes when the patch has been applied to ASTContext.cpp, and fails otherwise.
> 
> Please let me know if this looks OK, or if any additional information is needed.
> 
> Thanks,
> 
> David
> 
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