[cvs-nhc98] patch applied (yhc): Added Wadler's optimisation (using the GC)

[Neil Mitchell]

Thu Feb  7 07:15:14 PST 2008  Tom Shackell <shackell at cs.york.ac.uk>
  * Added Wadler's optimisation (using the GC)

    M ./src/runtime/BCKernel/mark.c -13 +77
    M ./src/runtime/BCKernel/mark.h +3
    M ./src/runtime/BCKernel/module.c +6
    M ./src/runtime/BCKernel/module.h +3
    M ./src/runtime/BCKernel/node.h -1 +1
    M ./src/runtime/BCKernel/pretty.c +2
    M ./tests/conformance98/importas/ReportB.hbc
    M ./tests/conformance98/importas/ReportC.hbc
    M ./tests/conformance98/importas/ReportD.hbc