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

[Björn Steinbrink]

Thanks for the feedback!

Added a testcase and replaced the ternary operators with if statements.

I did not use an early return for the !Val case though, because that would,
AFAICT, stop the user from removing existing metadata.


http://reviews.llvm.org/D7165

Files:
  lib/IR/Core.cpp
  test/Bindings/llvm-c/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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