The `reconcile-unrealized-casts` pass used to crash when the input
contains circular chains of `unrealized_conversion_cast` ops.
Furthermore, the `reconcileUnrealizedCasts` helper functions used to
erase ops that were not passed via the `castOps` operand. Such ops are
now preserved. That's why some integration tests had to be changed.
Also avoid copying the set of all unresolved materializations in
`convertOperations`.
This commit is in preparation of turning `RewriterBase::replaceOp` into
a non-virtual function.
This is a re-upload of #158067, which was reverted due to CI failures.
Note for LLVM integration: If you are seeing tests that are failing with
`error: LLVM Translation failed for operation:
builtin.unrealized_conversion_cast`, you may have to add the
`-reconcile-unrealized-casts` pass to your pass pipeline. (Or switch to
the `-convert-to-llvm` pass instead of combining the various
`-convert-*-to-llvm` passes.)
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Co-authored-by: Mehdi Amini <joker.eph@gmail.com>
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