* All IR modifications are done with a rewriter.
* The new C++ entry point takes a `RewriterBase &`, which may have a listener attached to it.
This revision is useful because it allows users to run CSE and track IR modifications via a listener that can be attached to the rewriter.
This is a reupload. The original CL was reverted (9979417d4d) due to a memory leak. The memory leak is unrelated to this change and fixed with D154185.
Differential Revision: https://reviews.llvm.org/D145226
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