[PATCH] Infer $pc in a file's trace frame

[Stan Shebs]

Eli Zaretskii wrote:
> This is okay, but the last two sentences leave so much stuff
> unexplained that I doubt the reader will be able to understand their
> meaning, unless she is a tracepoint hacker.  [...]

It is a little obscure to explain, in fact it's a fundamental flaw of 
the tdump implementation that I didn't fully understand myself until 
recently.

What I did for now was to whack those last two sentences, and add a 
couple more paragraphs in the tdump description.  After writing them, my 
main thought is "what a lame design, can't we do tdump better?".  :-)  
So perhaps after gdbserver tracepoints go in and more people get some 
familiarity, we should revisit both code and  documentation.

Stan