Fix and Continue, part 1

[Mike Stump <mrs at apple dot com>]

These add a feature to the compiler called fix-and-continue.  Basically 
gcc inserts nops at the start of functions so that the debugger can 
rewrite them to forward old functions to newly loaded instances of 
those functions in a running debugging session.

If people are interested in hearing more, I'd be happy to say more...

There is another set of changes that indirect all global data accesses 
through pointers at runtime, so that the newly loaded code will get the 
old data, instead of any new data.  I'll be submitting that next.

Ok?

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