Uday Bondhugula b5f8a4be27 Introduce parser library method to parse list of region arguments
- introduce parseRegionArgumentList (similar to parseOperandList) to parse a
  list of region arguments with a delimiter
- allows defining custom parse for op's with multiple/variadic number of
  region arguments
- use this on the gpu.launch op (although the latter has a fixed number
  of region arguments)
- add a test dialect op to test region argument list parsing (with the
  no delimiter case)

Signed-off-by: Uday Bondhugula <uday@polymagelabs.com>

Closes tensorflow/mlir#40

PiperOrigin-RevId: 259442536
2019-07-22 17:42:08 -07:00
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