Short Circuit Analysis

I've checked in some code that detects branches to branches and merges them if they meet some basic requirements. As such, Boomerang can now generate code like:

if (a < b && b < c) {
// x
} else {
// y
}

instead of generating a goto statement. I've checked in a couple of test programs that exercise this analysis. I havn't looked at how this analysis effects loops or more obscure control structures.. so there could well be bugs here.

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