Introduced the concept of "host function".
Introduced the concept of "host function".

This is the great cheat object.  We define a target object whose linkage
code calls a new machine instruction.  This new machine instruction
simulates a function call in the target by calling a function in the
host, using the values from the argument registers, and returning values
there as well.

clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL