PATCH: factor common GC code, again

[Jeffrey A Law]

  In message < 19990911124540.A15155@cygnus.com >you write:
  > On Sat, Sep 11, 1999 at 10:16:28AM -0700, Alex Samuel wrote:
  > > Separate out code in ggc-simple.c that is not specific to the simple
  > > GC and place it in a new source file, ggc.c.  This is in preparation
  > > for the addition of a new GC.  
  > 
  > Applied, thanks.
Really?  I don't see a ggc.c anywhere.

jeff