Break statements

When using br or br_if in WebAssembly, you provide a number to the statement that indicates which level to jump to, 0 is the current block, 1 is the parent block, 2 is the the parent's parent block, and so on:

(func $process
      i32.const 1
      i32.const 1
        (br 0) ;; leaves the current if-block
        (br 1) ;; jumps to the start of the loop-block, i.e. continue
        (br 2) ;; leaves the loop and goes back to the block, i.e. break
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