Uncovered NOP runs

[Petr Machata <pmachata at redhat dot com>]

Hi,

.debug_arange analysis shows that there's a lot of holes in .text. 
Turns out these are NOP runs (for alignment purposes, I guess).  First, 
is it OK for the producer to leave NOP runs alone?  If yes, dwarflint 
shouldn't warn about it, but then there is a problem of how to detect this.

I think we can assume that the compiler actually emits literal "NOP" 
instructions for padding purposes (i.e. not one of these contraptions 
that look like they do something).  But most of the time, we won't even 
see contents of .text, will we?  We are dealing with stripped 
debuginfo-only files.  Or are we going to do our debuginfo 
transformation business on full files?

PM

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