/usr/bin/llvm-g++-4.8 is in llvm-gcc-4.8 3.3-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 | #!/bin/sh
exec ${0#/usr/bin/llvm-} -fplugin=/usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/dragonegg.so "$@"
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