/usr/bin/pollycc is in clang-3.4 1:3.4-1ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#!/bin/sh clang -Xclang -load -Xclang /usr/lib/llvm-3.4/lib/LLVMPolly.so $@