[cvs-nhc98] patch applied (hat): Hat: speed up cEnter, and remove its NmType argument.

[Malcolm Wallace]

Thu Apr  5 07:41:15 PDT 2001  malcolm
  * Hat: speed up cEnter, and remove its NmType argument.
    Because cEnter is called on every reduction step, any improvement in
    its speed should go a long way.  At the moment, it looks like we gain
    only about 1.5% by eliminating tests in C that are no longer useful.
    However, by eliminating its NmType argument, we hope that we can
    change some of the transformation/combinators, to produce much fewer
    NmType nodes in the file.

    M ./src/old/runtime/io.c -2 +8