Dead Code Elimination Variants
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-dce (Dead Code Elimination)
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Most aggressive dead code elimination algorithm. This searches for dead
instructions, then rechecks after eliminations have occurred. This allows
removal of functions such as

::

    void A() {
        B();
    }

    void B() {
        return;
    }

    int main() {
        return 0;
    }

Not only function A, but then function B in the same pass (whereas -die would
only be able to detect function A)

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-deadargelim (Dead Argument Elimination)
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Removes arguments which are obviously unused. Does further removal of arguments
which are simply forwarded to other unused arguments.

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-deadtypeelim (Dead Type Elimination)
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(IN PROGRESS)

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-die (Dead Instruction Elimination)
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Obvious removal of dead code.
See -dce above.

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-dse (Dead Store Elimination)
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(IN PROGRESS)