Emit naked body of guard statements.

[mbj]

Seems there is a regression that does NOT mutate the following:

expression if condition

into

expression

I thought we have it. But it seems to be defunct.

For external consumers, this will still render as:

if condition
  expression
end

in the reports. I'm talking about the concepts here.

And relax, condition and expression get fully mutated currently. The condition will be forced to true and false respectively so its not that much of blind coverage.