Rahul Joshi fe7fdcac87 [MLIR] Fix parseFunctionLikeOp() to fail parsing empty regions ...

- Change parseOptionalRegion to return an OptionalParseResult.
- Change parseFunctionLikeOp() to fail parsing if the function body was parsed but was
  empty.
- See https://llvm.discourse.group/t/funcop-parsing-bug/2164

Differential Revision: https://reviews.llvm.org/D91886

2020-12-04 09:09:59 -08:00

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