[Attributor] Unittest for Attributor
Summary: This patch introduces basic unittest interface for the Attributor and a simple test case for casting. Reviewers: jdoerfert, sstefan1, uenoku, homerdin, baziotis Reviewed By: jdoerfert Subscribers: mgorny, uenoku, kuter, okura, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D83754
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