RFR (S): 8214791: Rename vm_operations_g1* files to g1VMOperations*

[Roman Kennke]

> I'm assuming there are reasons we have to repeat the "name" part in the
> file name even though it's uniquely determined by the directory path?
> Afterall:
> 
> #include <g1/g1Foo.hpp>
> 
> does look somewhat redundant versus
> 
> #include <g1/foo.hpp>

Some anecdote about this, my favorite include reads:

#include "gc/g1/c1/g1BarrierSetC1.hpp"

:-D

Cheers,
Roman