Reductions table being recreated on each parser invocation

[dsyme]

It looks like the reductions table is now created lazily, to reduce startup cost. But after creation it is not saved in any way (lazy is not used).

e.g.

let tables () : Internal.Utilities.Text.Parsing.Tables<_> = 
  { reductions= _fsyacc_reductions ();
    endOfInputTag = _fsyacc_endOfInputTag;
    ... }
let ilInstrs lexer lexbuf : ILInstr array = Microsoft.FSharp.Core.Operators.unbox ((tables ()).Interpret(lexer, lexbuf, 0))

We should probably save the table after creation.