[PATCH] D29743: [GlobalISel] Separate the SelectionDAG importer from the emitter. NFC: alternative using Expected<>

[Ahmed Bougacha via Phabricator via llvm-commits]

ab created this revision.
Herald added subscribers: rovka, dberris.

This is an alternative to parts of https://reviews.llvm.org/D29709: instead of appending our new RuleMatcher to a vector, return it and the SkipReason as an Expected<RuleMatcher>.

It's a somewhat unconventional use of Error, but it's nicer than, say, std::pair because of the bool conversions.


https://reviews.llvm.org/D29743

Files:
  utils/TableGen/GlobalISelEmitter.cpp

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