[llvm] r227319 - Fix LLVMSetMetadata and LLVMAddNamedMetadataOperand for single value MDNodes

[Hans Wennborg]

Björn asked for this and r227339 to be merged to 3.6. Duncan, does
this sound OK to you?

On Wed, Jan 28, 2015 at 8:36 AM, Bjorn Steinbrink <bsteinbr at gmail.com> wrote:
> Author: bsteinbr
> Date: Wed Jan 28 10:35:59 2015
> New Revision: 227319
>
> URL: http://llvm.org/viewvc/llvm-project?rev=227319&view=rev
> Log:
> Fix LLVMSetMetadata and LLVMAddNamedMetadataOperand for single value MDNodes
>
> Summary:
> MetadataAsValue uses a canonical format that strips the MDNode if it
> contains only a single constant value. This triggers an assertion when
> trying to cast the value to a MDNode.
>
> Subscribers: llvm-commits
>
> Differential Revision: http://reviews.llvm.org/D7165