compiler: Note non-obvious behavior of beam_ssa:split_blocks/4

[frej]

beam_ssa:split_blocks/4 does not split and create a new empty block if the predicate returns true for the first instruction in a block. As I have gotten tripped up on this for the second time, the first time was at least a year ago, note this in the function comment.

[github-actions[bot]]

CT Test Results

    2 files    323 suites   9m 9s :stopwatch:   821 tests   819 :white_check_mark: 2 :zzz: 0 :x: 5 447 runs  5 445 :white_check_mark: 2 :zzz: 0 :x:

Results for commit d90b0b28.

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[bjorng]

Thanks!