[patch] remove vcg CFG dumper

[Steven Bosscher]

Hello,

With the new GraphViz CFG dumper, the VCG dumper is now redundant. It
could only dump the CFG just after constructing it, and it doesn't
work as well as the DOT dumper (especially for multiple functions).

Bootstrapped&tested on powerpc64-unknown-linux-gnu. OK for trunk?

Ciao!
Steven
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