[PATCH] D145871: TableGen: Introduce `!range` operator for half-opened interval

[NAKAMURA Takumi via Phabricator via llvm-commits]

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`!range(a, b)` generates a list `[a,b)`. `a` is optional and `0` by default.

- `!range(-1, 4)` generates `[-1, 0, 1, 2, 3]`
- `!range(4)` generates `[0, 1, 2, 3]`
- `!range(2, 2)` generates `[]<list<int>>`

`!range(list)` is equivalent to `!range(0, !size(list))`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145871

Files:
  llvm/docs/TableGen/ProgRef.rst
  llvm/include/llvm/TableGen/Record.h
  llvm/lib/TableGen/Record.cpp
  llvm/lib/TableGen/TGLexer.cpp
  llvm/lib/TableGen/TGLexer.h
  llvm/lib/TableGen/TGParser.cpp
  llvm/test/TableGen/range-op-fail.td
  llvm/test/TableGen/range-op.td

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