Optimisation flags at -O0

[Chris Heller]

I wanted to understand better what `-fspec-constr` does.

So I compiled the User Guide example with `-O0 -fspec-constr` to isolate
the effects of call-pattern specialization, and nothing else (I used
ghc-core to pretty-print the resulting Core syntax).

It appears I get the same output wether I use `-fspec-constr` or not.

Does this mean that compiling with `-O0` even explicitly enabled
optimizations are turned off?

If that is the case, how does one test an isolated optimization?

-Chris
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