Log of /RuleDispatch/src/dispatch/assembler.txt

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Added jumps, labels, and backpatching forward references, all of which 
turned out to be easier to do than I expected, as long as we assume 
the total code size is <64K.  At this point, the assembler probably has 
everything it will need for doing generic function stuff, so I probably 
won't bother with any special support for loops or try: blocks, or for 
that matter nested scopes.  At some point, the <64K limit for jump 
handling may need to be fixed, though, if we ever generate big enough 
generic functions.  (Which assumes I ever manage to generate something 
useful with this module in the first place, which is not a given at
this point.)

Preliminary draft of an "assembler" for Python bytecode, to be used
in later code generation of generic functions.  The only features
missing at this point are jumps, block management, and nested scope
support.  Docs are also sketchy as yet, but I wanted to get a snapshot 
into source control before I stop work on it for now.  See assembler.txt 
for examples of what's implemented so far.