Rahul Joshi e2b716105b [MLIR] Add argument related API to Region ...

- Arguments of the first block of a region are considered region arguments.
- Add API on Region class to deal with these arguments directly instead of
  using the front() block.
- Changed several instances of existing code that can use this API
- Fixes https://bugs.llvm.org/show_bug.cgi?id=46535

Differential Revision: https://reviews.llvm.org/D83599

2020-07-14 09:28:29 -07:00

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