Shift left

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It picks two stack values and shifts the first one's bits the amount specified by the second one.

Shifting 1 by x will return the x power of 2.

Shifting x by 1 is the same as multiplying it by 2.

Shifting x by 2 is the same as multiplying it by 4.

Shifting x by 3 is the same as multiplying it by 8, and so on.