Merging r183153:

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r183153 | dmalea | 2013-06-03 13:45:54 -0700 (Mon, 03 Jun 2013) | 7 lines

Fix crash (in optimized builds) due to invalid metadata operand
- ConstantDataArray is not a valid MDNode operand
- encode function-name strings in metadata by wrapping in an MDString instead

- should resolve reported by http://llvm-jenkins.debian.net/job/llvm-toolchain-quantal-binaries/architecture=amd64,distribution=quantal/173/


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llvm-svn: 183191