=> R3 = 0 to start, or R3 last found
R0 = class code (24-bit)
R1 = mask (matches if (function_class AND R1) = R0)
<= R3 = function handle
Finds the function handle based on the class passed. Only the bits in R1 of the
class code will be checked so a mask of -1 will search for an exact match.
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