[PATCH] D149016: [TableGen] Make defvar prior to class template arguments

[Wang Pengcheng via Phabricator via llvm-commits]

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In D148197 <https://reviews.llvm.org/D148197>, we have make `defvar` statement able to refer class
template arguments. However, the priority of class/multiclass
template arguments are higher then variables defined by defvar,
which is a little counterintuitive.

In this patch, we make variables defined by `defvar` prior to
class/multiclass template arguments. The shadow rules now are:

- `V` in a record body shadows a global `V`.

- `V` in a record body shadows template argument `V`.

- `V` in template arguments shadows a global `V`.

- `V` in a `foreach`` statement list shadows any `V` in surrounding

record or global scopes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149016

Files:
  llvm/docs/TableGen/ProgRef.rst
  llvm/lib/TableGen/TGParser.cpp
  llvm/lib/TableGen/TGParser.h
  llvm/test/TableGen/defvar.td

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