Transistor length doesn't support pint expressions

[nbingham1]

Describe the bug When using a pint expression to set the transistor length, aflat produces a parse error about transistor flavor. Notice that replacing "B" with 20 does not produce this error.

To Reproduce Steps to reproduce the behavior:

1. Use the ACT source included below.
2. Run the following sequence of commands: aflat test.act
3. Observe that the following parse error occurs.

   Parse error: Could not parse entire file.
   Error parsing production rule: unknown transistor flavor
   File `test.act', line: 8, col: 9.
   Exception: number=1, message -none-
   FATAL: Uncaught exception

ACT source test.act:

pint A = 6;
pint B = 20;

defproc test()
{
  bool a, b;
  prs {
    a<A,B> -> b-
    ~a<A,B> -> b+
  }
}

test t;

Expected behavior aflat succeeds and emits the flattened prs.

Computer setup (please complete the following information): Ubuntu 20.10 gcc 10.2.0 GNU Make 4.3 ACT commit a75aa488c29edb8e8b29fa1e215c54793b9582cc

[rmanohar]

Should be fixed now.

[nbingham1]

Yep, its fixed. Thanks!