[PATCH] Fix LLVMSetMetadata for MDNodes that contain a single value

[Björn Steinbrink]

Added an MDNode extraction function with proper assertions, fixed
LLVMAddNamedMetadataOperand, and wrote a test for it.


http://reviews.llvm.org/D7165

Files:
  lib/IR/Core.cpp
  test/Bindings/llvm-c/add_named_metadata_operand.ll
  test/Bindings/llvm-c/set_metadata.ll
  tools/llvm-c-test/CMakeLists.txt
  tools/llvm-c-test/llvm-c-test.h
  tools/llvm-c-test/main.c
  tools/llvm-c-test/metadata.c

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