c6a892e0ed
This reverts commit 54e70ac7650f1c22f687937d1a082e4152f97b22 which
itself fixed an [asan
leak](https://lab.llvm.org/buildbot/#/builders/55/builds/9761) from the
original upstreaming commit. The leak was due to op allocations not
being `free`ed.
~~The necessary change was to explicitly `->destroy()` the ops at the
end of the tests. I believe this is because the rewriter used in the
tests doesn't actually insert them into a module and so without an
explicit `->destroy()` no bookkeeping process is able to take care of
them.~~
The necessary change was to use `OwningOpRef` which calls `op->erase()`
in its [own
destructor](89cfae41ec/mlir/include/mlir/IR/OwningOpRef.h (L39)).
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